HTTP Request Smuggling Affecting python311-h11 package, versions <0.14.0-150400.9.6.1


Severity

Recommended
0.0
critical
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.58% (47th percentile)

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  • Snyk IDSNYK-SLES155-PYTHON311H11-10004990
  • published3 May 2025
  • disclosed2 May 2025

Introduced: 2 May 2025

CVE-2025-43859  (opens in a new tab)
CWE-444  (opens in a new tab)

How to fix?

Upgrade SLES:15.5 python311-h11 to version 0.14.0-150400.9.6.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python311-h11 package and not the python311-h11 package as distributed by SLES. See How to fix? for SLES:15.5 relevant fixed versions and status.

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

CVSS Base Scores

version 3.1