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Debian LTS Advisory DLA-4455-1 [email protected]
https://www.debian.org/lts/security/ Andrej Shadura
January 25, 2026 https://wiki.debian.org/LTS
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Package : python3.9
Version : 3.9.2-1+deb11u5
CVE ID : CVE-2025-11468 CVE-2025-12084 CVE-2025-15282 CVE-2025-15366
CVE-2025-15367 CVE-2026-0672 CVE-2026-0865 CVE-2026-1299
This upload fixes a regression introduced in 3.9.2-1+deb11u4 (DLA 4445-1),
and also fixes multiple security issues in cPython 3.9.
CVE-2025-12084
When building nested elements using xml.dom.minidom methods such
as appendChild() that have a dependency on _clear_id_cache() the
algorithm was quadratic. Availability could be impacted when building
excessively nested documents.
The fix for this CVE in the previous upload resulted in a regression
in software relying on ownerDocument attribute being always present
in Element instances. This regression has now been fixed.
CVE-2026-0672, CVE-2026-0865, CVE-2025-15282, CVE-2025-15366, CVE-2025-15367
These are all similar vulnerabilities in the following modules:
http.cookies, wsgiref.headers, imaplib, poplib, urllib. In each of
these control characters were handled incorrectly, allowing injection
of additional cookiers, headers or commands. Control characters are
now rejected in these contexts.
CVE-2025-11468
An issue similar to the above. Comments consisting of a very long
sequence of non-foldable characters could trigger a forced line wrap
that omitted the required leading space on the continuation line,
causing the remainder of the comment to be interpreted as a new
header field.
CVE-2026-1299
Another header injection issue: email module allowed header injection in the
BytesGenerator class. BytesGenerator will now refuse to serialize headers
that are unsafely folded or delimited.
For Debian 11 bullseye, these problems have been fixed in version
3.9.2-1+deb11u5.
We recommend that you upgrade your python3.9 packages.
For the detailed security status of python3.9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/python3.9
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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