VulnerabilityAwaiting Analysis
CVE-2026-1502
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
MEDIUM 5.7EPSS 0.56%
Does this matter?
Lower severity and a low EPSS score (0.56%). Track it; it rarely justifies an emergency change on its own.
Description
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
- CVSS 4.0
- 5.7 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.56% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-93
- Source
- cna@python.org
References
- https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69
- https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53
- https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e
- https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd
- https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed
- https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec
- https://github.com/python/cpython/issues/146211
- https://github.com/python/cpython/pull/146212
- https://mail.python.org/archives/list/security-announce@python.org/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/
- http://www.openwall.com/lists/oss-security/2026/04/11/4
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.