CVE-2026-1299 Affecting python3.11-libs package, versions <0:3.11.13-5.1.el9_7


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.04% (14th percentile)

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  • Snyk IDSNYK-ALMALINUX9-PYTHON311LIBS-15661051
  • published16 Mar 2026
  • disclosed10 Mar 2026

Introduced: 10 Mar 2026

CVE-2026-1299  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 python3.11-libs to version 0:3.11.13-5.1.el9_7 or higher.
This issue was patched in ALSA-2026:4216.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.11-libs package and not the python3.11-libs package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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".

References

CVSS Base Scores

version 3.1