Vulnerability in Python Software Foundation Cpython
CVE-2026-0865
User-controlled header names and values containing newlines can allow injecting HTTP headers.
Published · last modified .
EPSS exploit prediction
EPSS: 0.005 (43.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.001
Affected products
- Python Software Foundation Cpython — versions 0, 3.11.0, 3.12.0
Weakness classification (CWE)
References
- github.com/python/cpython/pull/143917 (patch)
- github.com/python/cpython/issues/143916 (issue-tracking)
- mail.python.org/archives/list/security-announce@python.org/thread/BJ6QPHNSHJTS3… (vendor-advisory)
- github.com/python/cpython/commit/22e4d55285cee52bc4dbe061324e5f30bd4dee58 (patch)
- github.com/python/cpython/commit/23e3c0ae867cca0130e441e776c9955b9027c510 (patch)
- github.com/python/cpython/commit/4802b96a2cde58570c24c13ef3289490980961c5 (patch)
- github.com/python/cpython/commit/f7fceed79ca1bceae8dbe5ba5bc8928564da7211 (patch)
- github.com/python/cpython/commit/2f840249550e082dc351743f474ba56da10478d2 (patch)
- github.com/python/cpython/commit/e4846a93ac07a8ae9aa18203af0dd13d6e7a6995 (patch)
- github.com/python/cpython/commit/66da7bf6fe7b81e3ecc9c0a25bd47d4616c8d1a6 (patch)