** Description changed:

  This bug tracks an update for the bind9 package, moving to versions:
  
- * Questing (25.10): Bind9 9.20.18
- * Noble (24.04): Bind9 9.18.44
- * Jammy (22.04): Bind9 9.18.44
+ * Resolute (26.04): Bind9 9.20.24
+ * Noble (24.04): Bind9 9.18.50
+ * Jammy (22.04): Bind9 9.18.50
  
  These updates include bug fixes following the SRU policy exception
  defined at
  https://documentation.ubuntu.com/sru/en/latest/reference/exception-
  Bind9-Updates
  
  [Upstream changes]
  
- 9.20.12-9.20.18
+ 9.20.12-9.20.24
  
  Updates:
  
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5529 - Remove the 
ineffective TCP fallback after repeated UDP timeouts (a corrected TCP fallback 
is to be restored in a future release).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5449 - Fall back to TCP on 
receipt of a UDP response with a mismatched query ID, and add a new MismatchTCP 
statistics counter.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5701 - Limit glue records 
cached from a referral to at most 20 IPv4 and 20 IPv6 addresses per nameserver.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5878 - Reject a CNAME 
response to a DS query promptly instead of stalling ~12s and returning SERVFAIL.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5891 - Spread cache 
cleanup probabilistically to avoid CPU spikes and slow queries when the cache 
approaches its memory limit.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/3695 - Record query time 
for all dnstap responses.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11569 - Optimize 
TCP source port selection on Linux via the IP_LOCAL_PORT_RANGE socket option.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5690 - Update requirements 
for the system test suite (Python 3.10 or newer now required; dependencies 
tracked in bin/tests/system/requirements.txt).
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11358 - Add more 
information to the rndc recursing output about fetches.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11304 - Provide 
more information when the memory allocation fails.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11258 - Reduce the 
number of outgoing queries when resolving the nameservers for delegation points.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5574 - Use exit code 1 
when providing illegal options to dnssec-verify.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5486 - Add dnssec-policy 
keys configuration check to named-checkconf.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5483 - Rndc sign during 
ZSK rollover will now replace signatures.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/4606 - Add manual mode 
configuration option to dnsec-policy.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5222 - Add a new 
'servfail-until-ready' configuration option for RPZ.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5444 - Add support for 
parsing HHIT and BRID records.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/4204 - Deprecate the 
"tkey-gssapi-credential" statement.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/4204 - Obsolete the 
"tkey-domain" statement.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5440 - Add support for 
parsing the DSYNC record
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/10738 - Add 
deprecation warnings for RSASHA1, RSASHA1-NSEC3SHA1 and DS digest type 1.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5342 - Add RPZ extended 
DNS error for zones with a CNAME override policy configured.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5388 - Log dropped or 
slipped responses in the query-errors category.
  
  Bug Fixes:
  
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5302 - Remove other RRsets 
at the same name when caching a CNAME (fixes stale-cache refresh).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5789 - Fix 
nxdomain-redirect combined with dns64 (AAAA query for a nonexistent name could 
abort named).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5934 - Fix DNS64 
owner-name case after a DNAME restart (use of freed memory / corrupted response 
data).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5936 - Clear the REDIRECT 
flag when it isn't needed (avoids an assertion when filter-aaaa is in use).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5990 - Disable output 
escaping in bind9.xsl so statistics charts display on all browsers.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5993 - Fix a crash on a 
badly configured secondary signer missing the file entry (now rejected).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/6001 - Fix a possible 
crash on concurrent TKEY DELETE for the same key.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/6002 - Reject RRSIG 
records covering meta-types (ANY, AXFR, IXFR, MAILA, MAILB).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5678 - Use the zone file's 
basename as origin in dnssec-signzone and dnssec-verify.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5767 - Fix a possible race 
condition (crash on IXFR) during zone transfers.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5818 - Fix named crash 
when processing SIG records in dynamic updates.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5834 - Fix zone 
verification of NSEC3 signed zones (out-of-bounds write).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5854 - Prevent a crash 
when using both dns64 and filter-aaaa.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5858 - Fix an assertion 
failure when processing catalog zones with an invalid TSIG key name.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5881 - Prevent malicious 
DNSSEC zones from exhausting validator CPU by rejecting DNSKEYs with an 
oversized RSA public exponent.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5903 - Fix rndc-confgen 
aborting on HMAC-SHA-384/512 keys above 512 bits.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5906 - Prevent crafted 
queries from degrading RRL performance via a per-process keyed hash.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5915 - Prevent a rare 
named crash when notifies are cancelled.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5916 - Stop delv from 
aborting on a malformed query name.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5938 - Fix a crash when 
reconfiguring while an NTA is being rechecked.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5941 - Fix a bug in 
allow-query/allow-transfer catalog zone custom properties.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5943 - Fix a memory leak 
in catalog zones.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11899 - Fix a 
suppressed missing-glue check in named-checkzone.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11845 - Implement 
seamless outgoing TCP connection reuse (RFC 7766), with pipelined queries per 
connection capped at 256.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11963 - Reject 
record sets too large to serve in DNS at storage time.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/4882 - Fix intermittent 
named crashes during asynchronous zone operations by enforcing loop affinity.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5760 - Count temporal 
DNSSEC validation problems as validation attempts.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5775 - Fix a possible 
deadlock in RPZ processing.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5800 - Fix a crash 
triggered by rndc modzone on a zone from a configuration file.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5801 - Fix processing of 
empty catalog zone ACLs.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5826 - Fix a crash 
triggered by rndc modzone on a zone that already existed in an NZF file.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11658 - Fix a 
potential resource leak during resolver error handling.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5761 - Fix handling of key 
statements defined inside views (regression from the 9.20.17 key-name 
hardening).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5728 - Fix a 
use-after-free in dns_client_resolve() triggered by a DNAME response (security 
fix, delv-only, no CVE assigned).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5759 - Fix an assertion 
failure triggered by non-minimal IXFRs.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5457 - Fix a crash when 
retrying a NOTIFY over TCP.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5588 - Fetch loop 
detection improvements for an in-domain nameserver with expired glue.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5695 - Randomize 
nameserver selection (fixes a resolution failure caused by DNSSEC-ordered NS 
selection introduced in 9.20.17).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5724 - Fix dnstap logging 
of forwarded queries.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5751 - Fix a stale answer 
being served on multiple upstream failures when following CNAME chains.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5757 - Fail DNSKEY 
validation when a supported but invalid DS is found (regression from 9.20.6; no 
security impact).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5758 - Fix stack memory 
corruption when importing an invalid SKR file.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11565 - Return 
FORMERR for queries with the EDNS Client Subnet FAMILY field set to 0.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5442 - Fix an inbound IXFR 
performance regression where very large IXFR transfers were much slower than in 
9.18.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5693 - Make catalog zone 
names and member zones' entry names case-insensitive.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5710 - Fix implementation 
of BRID and HHIT record types.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5711 - Fix implementation 
of DSYNC record type.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5714 - Fix response policy 
and catalog zones to work with the $INCLUDE directive.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5458 - Make key rollovers 
more robust.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5658 - Fix a catalog zones 
issue when a member zone could fail to load.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5659 - Allow glue in 
delegations with QTYPE=ANY.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5679 - Fix invalid zone 
from NSEC3 reconfiguration.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5672 - Fix slow speed of 
NSEC3 optout large delegation zone signing.
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5671 - Fix invalid NSEC3 
opt-out records left in zone.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11386 - Fix a 
possible catalog zone issue during reconfiguration.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11364 - Fix the 
charts in the statistics channel.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5671 - Fix invalid NSEC3 
opt-out records left in zone.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/3033 - Fix the spurious 
timeouts while resolving names.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5527 - Fix bug where zone 
switches from NSEC3 to NSEC after retransfer.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5620 - Attach socket 
before async streamdns_resume_processing.
  * https://gitlab.isc.org/isc-projects/bind9/-/issues/5639 - Fix AMTRELAY type 
0 presentation format handling.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5646 - Fix parsing bug in 
remote-servers with key or tls.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5653 - Fix TLS contexts 
cache object usage bug in the resolver.
- https://gitlab.isc.org/isc-projects/bind9/-/issues/5671 - Fix invalid NSEC3 
opt-out records left in zone.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5506 - Fix dnssec-keygen 
key collision checking for KEY rrtype keys.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5525 - Fix shutdown INSIST 
in dns_dispatchmgr_getblackhole.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5609 - Prevent assertion 
failures of dig when server is specified before the -b option.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5622 - Skip unsupported 
algorithms when looking for signing key.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11192 - Skip 
buffer allocations if not logging.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5165 - Use signer name 
when disabling DNSSEC algorithms.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5502 - Add missing DNSSEC 
information when CD bit is set in query.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5523 - Preserve cache when 
reload fails and reload the server again.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11032 - Check 
plugin config before registering.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5226 - Ensure file 
descriptors 0-2 are in use.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5294 - Prevent spurious 
SERVFAILs for certain 0-TTL resource records.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5467 - Use 
DNS_RDATACOMMON_INIT to hide branch differences.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5491 - Fix RPZ canonical 
warning displaying zone entry incorrectly.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5494 - Fix a catalog zone 
issue when having an unset 'default-primaries' configuration clause.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5243 - Fix stale RRsets in 
a CNAME chain were not always being refreshed.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5357 - Fix a possible 
crash when adding a zone while recursing.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5381 - Fix issue with dig 
failing to shutdown when interrupted, and unexpected termination when +keepopen 
used.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5422 - Fix scenarios where 
synth-from-dnssec was not working.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/10707 - Clean 
enough memory when adding new ADB names/entries under memory pressure.
  https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/10815 - Prevent 
spurious validation failures.
  
  CVE Fixes - already available as patch:
  
+ CVE-2026-3592 - Limit resolver server list size.
+ CVE-2026-3039 - Fix GSS-API resource leak.
+ CVE-2026-5946 - Disable recursion, UPDATE, and NOTIFY for non-IN views.
+ CVE-2026-5950 - Avoid unbounded recursion loop.
+ CVE-2026-5947 - Fix a crash in the resolver when SIG(0)-signed responses are 
received under load.
+ CVE-2026-3593 - Fix a use-after-free in DNS-over-HTTPS when processing HTTP/2 
SETTINGS frames.
+ CVE-2026-1519 - Fix unbounded NSEC3 iterations when validating referrals to 
unsigned delegations.
+ CVE-2026-3104 - Fix memory leaks in code preparing DNSSEC proofs of 
non-existence.
+ CVE-2026-3119 - Prevent a crash in code processing queries containing a TKEY 
record.
+ CVE-2026-3591 - Fix a stack use-after-return flaw in SIG(0) handling code.
  CVE-2025-13878 - Fix incorrect length checks for BRID and HHIT records.
  CVE-2025-8677 - Fix DNSSEC validation failing if matching but invalid DNSKEY 
is found.
  CVE-2025-40778 - Address various spoofing attacks.
  CVE-2025-40780 - Avoid cache-poisoning due to weak pseudo-random number 
generator.
  
- 9.18.40-9.18.44
+ 9.18.40-9.18.50
  
  Updates:
  
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5529 - Remove the 
ineffective TCP fallback after repeated UDP timeouts (a corrected TCP fallback 
is to be restored in a future release).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5449 - Fall back to TCP on 
receipt of a UDP response with a mismatched query ID, and add a new MismatchTCP 
statistics counter.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5891 - Spread cache 
cleanup probabilistically to avoid CPU spikes and slow queries when the cache 
approaches its memory limit.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5690 - Update requirements 
for the system test suite (Python 3.10 or newer now required; dependencies 
tracked in bin/tests/system/requirements.txt).
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5444 - Add support for 
parsing HHIT and BRID records.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/4204 - Deprecate the 
"tkey-domain" statement.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/4204 - Deprecate the 
"tkey-gssapi-credential" statement.
  
  Bug Fixes:
  
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5934 - Fix DNS64 
owner-name case after a DNAME restart (use of freed memory / corrupted response 
data).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5936 - Clear the REDIRECT 
flag when it isn't needed (avoids an assertion when filter-aaaa is in use).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/3589 - Fix an outgoing 
zone-transfer quota issue where unauthorized clients could block authorized 
transfers (security fix, no CVE assigned).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5818 - Fix named crash 
when processing SIG records in dynamic updates.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5834 - Fix zone 
verification of NSEC3 signed zones (out-of-bounds write).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5854 - Prevent a crash 
when using both dns64 and filter-aaaa.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5858 - Fix an assertion 
failure when processing catalog zones with an invalid TSIG key name.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5881 - Prevent malicious 
DNSSEC zones from exhausting validator CPU by rejecting DNSKEYs with an 
oversized RSA public exponent.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5903 - Fix rndc-confgen 
aborting on HMAC-SHA-384/512 keys above 512 bits.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5906 - Prevent crafted 
queries from degrading RRL performance via a per-process keyed hash.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5941 - Fix a bug in 
allow-query/allow-transfer catalog zone custom properties.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5943 - Fix a memory leak 
in catalog zones.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11899 - Fix a 
suppressed missing-glue check in named-checkzone.
+ https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/11963 - Reject 
record sets too large to serve in DNS at storage time.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5817 - Fix a crash when 
reconfiguring a zone's update policy during active updates (security fix, no 
CVE assigned).
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5800 - Fix a crash 
triggered by rndc modzone on a zone from a configuration file.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5826 - Fix a crash 
triggered by rndc modzone on a zone that already existed in an NZF file.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5751 - Fix a stale answer 
being served on multiple upstream failures when following CNAME chains.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5710 - Fix implementation 
of BRID and HHIT record types.
+ https://gitlab.isc.org/isc-projects/bind9/-/issues/5711 - Fix implementation 
of DSYNC record type.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5659 - Allow glue in 
delegations with QTYPE=ANY.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5679 - Fix invalid zone 
from NSEC3 reconfiguration.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5671 - Fix invalid NSEC3 
opt-out records left in zone.
+ * https://gitlab.isc.org/isc-projects/bind9/-/issues/5639 - Fix AMTRELAY type 
0 presentation format handling.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5622 - Skip unsupported 
algorithms when looking for signing key.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5294 - Prevent spurious 
SERVFAILs for certain 0-TTL resource records.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5491 - Fix RPZ canonical 
warning displaying zone entry incorrectly.
  https://gitlab.isc.org/isc-projects/bind9/-/issues/5502 - Add missing DNSSEC 
information when CD bit is set in query.
- * https://gitlab.isc.org/isc-projects/bind9/-/issues/5639 - Fix AMTRELAY type 
0 presentation format handling.
  
  CVE Fixes - already available as patch:
  
+ CVE-2026-3592 - Limit resolver server list size.
+ CVE-2026-3039 - Fix GSS-API resource leak.
+ CVE-2026-5946 - Disable recursion, UPDATE, and NOTIFY for non-IN views.
+ CVE-2026-5950 - Avoid unbounded recursion loop.
+ CVE-2026-1519 - Fix unbounded NSEC3 iterations when validating referrals to 
unsigned delegations.
  CVE-2025-13878 - Fix incorrect length checks for BRID and HHIT records.
  CVE-2025-8677 - Fix DNSSEC validation failing if matching but invalid DNSKEY 
is found.
  CVE-2025-40778 - Address various spoofing attacks.
  CVE-2025-40780 - Avoid cache-poisoning due to weak pseudo-random number 
generator.
  
  Backwards-incompatible changes:
  
  * Going through upstream changes on a commit-by-commit basis alongside the 
release notes, I found one commit which may include backward-incompatible 
changes for some users - 
https://gitlab.isc.org/isc-projects/bind9/-/commit/adf104a06339f101d295c1c7980725be5af73dfa
- It includes the following note - "Instances of this record will need the 
placeholder period added to them when upgrading."
+ It includes the following note - "Instances of this record will need the 
placeholder period added to them when upgrading." This will only be an issue in 
Noble and Jammy as Resolute is on 9.20.18 and this was introduced in the 9.20.x 
series in 9.20.17.
  
  [Test Plan]
  
  DEP-8 Tests:
  
  simpletest - Confirms bind9 daemon starts successfully and dig can find
  127.0.0.1 through the default setup of bind9
  
  zonetest - Added in this update, currently in lunar. Confirms the
  functionality of named and bind9 by creating a local DNS zone and
  domain, and having dig look it up
  
  dyndb-ldap (noble and earlier) - Verifies functionality of bind-dyndb-
  ldap against the updated bind9 package with a basic setup. This also
  fails intentionally prior to bind-dyndb-ldap being rebuilt against the
  package, as this is a necessary step for bind9 updates.
  
  validation - This test is provided by Debian and consistently fails both 
before and after the update due to several issues. It is marked as flaky, and 
does not block autopkgtest passing overall
  [Regression Potential]
  
  Upstream has an extensive build and integration test suite. So
  regressions would likely arise from a change in interaction with Ubuntu-
  specific integrations.
  
  [Other Info]
  
  Previous backports:
  
  (LP: #2003586)
  (LP: #2028413)
  (LP: #2040459)
  (LP: #2073310)
  (LP: #2112520)
  
  For noble and jammy, bind-dyndb-ldap must also be rebuilt to match the
  new version. This time it has a conflicting macro called CHECK which
  will be renamed in a patch to the bind-dyndb-ldap package.

** Summary changed:

- Backport of bind9 for questing, noble, and jammy
+ Backport of bind9 for resolute, noble, and jammy

** Changed in: bind-dyndb-ldap (Ubuntu)
    Milestone: ubuntu-26.06 => ubuntu-26.07

** Changed in: bind9 (Ubuntu)
    Milestone: ubuntu-26.05 => ubuntu-26.07

** Also affects: bind9 (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** Also affects: bind-dyndb-ldap (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** No longer affects: bind9 (Ubuntu Questing)

** No longer affects: bind-dyndb-ldap (Ubuntu Resolute)

** Changed in: bind9 (Ubuntu Resolute)
       Status: New => In Progress

** Changed in: bind9 (Ubuntu Resolute)
     Assignee: (unassigned) => Lena Voytek (lvoytek)

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https://bugs.launchpad.net/bugs/2126464

Title:
  Backport of bind9 for resolute, noble, and jammy

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