CRLF Injection Affecting python311-h2 package, versions <4.1.0-150400.8.6.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
1.88% (80th percentile)

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  • Snyk IDSNYK-SLES157-PYTHON311H2-12657400
  • published13 Sept 2025
  • disclosed12 Sept 2025

Introduced: 12 Sep 2025

CVE-2025-57804  (opens in a new tab)
CWE-93  (opens in a new tab)

How to fix?

Upgrade SLES:15.7 python311-h2 to version 4.1.0-150400.8.6.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python311-h2 package and not the python311-h2 package as distributed by SLES. See How to fix? for SLES:15.7 relevant fixed versions and status.

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls. This issue has been patched in version 4.3.0.

CVSS Base Scores

version 3.1