CVE-2026-1502
HTTP client proxy tunnel headers not validated for CR/LF
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: PSFAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| CPython Python Software Foundation http.client
|
≥ 0; < 3.10.21 (affected, python) ≥ 3.11.0; < 3.11.16 (affected, python) ≥ 3.12.0; < 3.12.14 (affected, python) ≥ 3.13.0; < 3.13.14 (affected, python) ≥ 3.14.0a1; < 3.14.5rc1 (affected, python) ≥ 3.15.0a1; < 3.15.0b1 (affected, python) Other versions: unaffected |
CNA: PSF |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.7 medium |
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 | CNA: PSF |
| 4.0 / 5.7 medium |
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/python/cpython/pull/146212CNA: PSF · patch
- https://github.com/python/cpython/issues/146211CNA: PSF · issue-tracking
- https://mail.python.org/archives/list/[email protected]/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/CNA: PSF · vendor-advisory
- https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69CNA: PSF · patch
- https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2edCNA: PSF · patch
- https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8ddCNA: PSF · patch
- https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ecCNA: PSF · patch
- https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53CNA: PSF · patch
- https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3eCNA: PSF · patch
- http://www.openwall.com/lists/oss-security/2026/04/11/4ADP: CVE
- https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
- https://github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69[email protected]
- https://github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53[email protected]
- https://github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e[email protected]
- https://github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd[email protected]
- https://github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed[email protected]
- https://github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec[email protected]
- https://github.com/python/cpython/issues/146211[email protected]
- https://github.com/python/cpython/pull/146212[email protected]
- https://mail.python.org/archives/list/[email protected]/thread/2IVPAEQWUJBCTQZEJEVTYCIKSMQPGRZ3/[email protected]
- http://www.openwall.com/lists/oss-security/2026/04/11/4af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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