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Debian LTS Advisory DLA-4524-2                [email protected]
https://www.debian.org/lts/security/                   Jochen Sprickerhof
April 17, 2026                                https://wiki.debian.org/LTS
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Package        : postgresql-13
Version        : 13.23-0+deb11u3

The fix for CVE-2026-2006 introduced a regression in SUBSTRING() for toasted
multibyte characters, as discussed in the upstream bug:

https://www.postgresql.org/message-id/[email protected]

Also a number of minor upstream fixes for the patches added in 13.23-0+deb11u2
where added:
 * pg_mblen_range, pg_mblen_with_len: Valgrind after encoding ereport.
 * Suppress new "may be used uninitialized" warning.
 * Fix test_valid_server_encoding helper function.
 * pgcrypto: Tweak error message for incorrect session key length.

For Debian 11 bullseye, this problem has been fixed in version
13.23-0+deb11u3.

We recommend that you upgrade your postgresql-13 packages.

For the detailed security status of postgresql-13 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/postgresql-13

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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