CVE-2026-1502

MEDIUM

HTTP client proxy tunnel headers not validated for CR/LF

Title source: cna

Description

CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.

References (6)

[Patch] https://github.com/python/cpython/pull/146212

[Issue Tracking] https://github.com/python/cpython/issues/146211

[Vendor Advisory] https://mail.python.org/archives/list/[email protected]/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/

[Patch] https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69

View Patch ZIP pw:eip

[Mailing List] http://www.openwall.com/lists/oss-security/2026/04/11/4

[Patch] https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed

Scores

CVSS v4 5.7

EPSS 0.0006

EPSS Percentile 18.8%

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Details

Status published

Products (1)

Python Software Foundation/CPython < 3.15.0

Published Apr 10, 2026

Tracked Since Apr 11, 2026