CVE-2026-17084 Affecting python-3.11 package, versions <3.11.16-r5


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.6% (47th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-PYTHON311-19520038
  • published4 Sept 2026
  • disclosed18 Aug 2026

Introduced: 18 Aug 2026

NewCVE-2026-17084  (opens in a new tab)

How to fix?

Upgrade Chainguard python-3.11 to version 3.11.16-r5 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-3.11 package and not the python-3.11 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

The "stringprep" module didn't process characters from RFC 3454 tables B.2 or B.3 correctly: the latest Unicode codepoint attributes were used instead of the specified Unicode 3.2.0. This behavior would cause mismatches when processing domain names using IDNA 2003 (the "idna" codec) and the in_table_b2() function of the "stringprep" module. This only affects domain names containing characters that were not previously registered or had their Unicode attributes such as case-folding behavior updated since Unicode 3.2.0.

CVSS Base Scores

version 3.1