HTTP client proxy tunnel headers not validated for CR/LF

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Summary

CVECVE-2026-1502
StatePUBLISHED
AssignerPSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-10 18:16:40 UTC
Updated2026-06-30 16:16:48 UTC
DescriptionCR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.

Risk And Classification

Primary CVSS: v4.0 5.7 MEDIUM from [email protected]

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

EPSS: 0.000230000 probability, percentile 0.065900000 (date 2026-06-08)

Problem Types: CWE-93 | CWE-93 CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.7MEDIUMCVSS: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/C...
4.0CNACVSS5.7MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
High
User Interaction
Passive
Confidentiality
None
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python Software Foundation CPython affected 3.13.14 python Not specified
CNA Python Software Foundation CPython affected 3.14.0a1 3.14.5rc1 python Not specified
CNA Python Software Foundation CPython affected 3.15.0a1 3.15.0b1 python Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/04/11/4 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/python/cpython/commit/56b7100b04e44ea27989242b176beb8f016b2c53 [email protected] github.com
github.com/python/cpython/commit/c00c386faa579ad71196d33408644478488e43ec [email protected] github.com
github.com/python/cpython/commit/b1cf9016335cb637c5a425032e8274a224f4b2ed [email protected] github.com
github.com/python/cpython/commit/05ed7ce7ae9e17c23a04085b2539fe6d6d3cef69 [email protected] github.com
github.com/python/cpython/commit/58703ec1bdd1eb075e8b01a0c427683ce594dd3e [email protected] github.com
github.com/python/cpython/commit/9e071c9b28c17f347f81b388a003d4eeb3c7a8dd [email protected] github.com
github.com/python/cpython/pull/146212 [email protected] github.com
github.com/python/cpython/issues/146211 [email protected] github.com
mail.python.org/archives/list/[email protected]/thread/2IVPAEQWUJB... [email protected] mail.python.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: senseicat (en)

CNA: Seth Larson (en)

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