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Medium 5.7Published Apr 10, 2026
CVE-2026-1502HTTP client proxy tunnel headers not validated for CR/LF
Updated under an hour ago ()
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It affects Python Software Foundation CPython. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
- CVSS
- 5.7 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-93
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- PSF
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Python Software Foundation CPython python_software_foundation:cpython (from the name) | before 3.10.21; from 3.11.0 before 3.11.16; from 3.12.0 before 3.12.14; from 3.13.0 before 3.13.14; from 3.14.0a1 before 3.14.5rc1; from 3.15.0a1 before 3.15.0b1 | CNA record |
References
- https://github.com/python/cpython/pull/146212patch
- https://github.com/python/cpython/issues/146211issue-tracking
- https://mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/vendor-advisory
- https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69patch
- https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2edpatch
- https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8ddpatch
- https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ecpatch
- https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53patch
- https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3epatch
- http://www.openwall.com/lists/oss-security/2026/04/11/4
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.