Source: python3.14
Version: 3.14.2-1
Severity: important
Tags: security upstream
Forwarded: https://github.com/python/cpython/issues/144125
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Control: clone -1 -2 -3
Control: reassign -2 src:python3.13 3.13.11-1
Control: retitle -2 python3.13: CVE-2026-1299
Control: reassign -3 src:pypy3 7.3.20+dfsg-4
Control: retitle -3 pypy3: CVE-2026-1299

Hi,

The following vulnerability was published for python.

CVE-2026-1299[0]:
| The  email module, specifically the "BytesGenerator" class, didn’t
| properly quote newlines for email headers when  serializing an email
| message allowing for header injection when an email  is serialized.
| This is only applicable if using "LiteralHeader" writing headers
| that don't respect email folding rules, the new behavior will reject
| the incorrectly folded headers in "BytesGenerator".


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-1299
    https://www.cve.org/CVERecord?id=CVE-2026-1299
[1] https://github.com/python/cpython/issues/144125
[2] 
https://mail.python.org/archives/list/[email protected]/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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