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cpython: wsgiref.headers.Headers allows header newline injection in Python

🗓️ 05 Feb 2026 15:48:06Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 8 Views

Python wsgiref.headers.Headers lacks newline filtering, enabling header injection from user controlled names or values.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8aarch64platform-python0:3.6.8-73.el8_10platform-python-0:3.6.8-73.el8_10.aarch64.rpm
Red Hat Enterprise Linux8ppc64leplatform-python0:3.6.8-73.el8_10platform-python-0:3.6.8-73.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8s390xplatform-python0:3.6.8-73.el8_10platform-python-0:3.6.8-73.el8_10.s390x.rpm
Red Hat Enterprise Linux8x86_64platform-python0:3.6.8-73.el8_10platform-python-0:3.6.8-73.el8_10.x86_64.rpm
Red Hat Enterprise Linux8anyplatform-python0:3.6.8-73.el8_10.i686platform-python-0:3.6.8-73.el8_10.i686.noarch.rpm
Red Hat Enterprise Linux8aarch64platform-python-debug0:3.6.8-73.el8_10platform-python-debug-0:3.6.8-73.el8_10.aarch64.rpm
Red Hat Enterprise Linux8ppc64leplatform-python-debug0:3.6.8-73.el8_10platform-python-debug-0:3.6.8-73.el8_10.ppc64le.rpm
Red Hat Enterprise Linux8s390xplatform-python-debug0:3.6.8-73.el8_10platform-python-debug-0:3.6.8-73.el8_10.s390x.rpm
Red Hat Enterprise Linux8x86_64platform-python-debug0:3.6.8-73.el8_10platform-python-debug-0:3.6.8-73.el8_10.x86_64.rpm
Red Hat Enterprise Linux8anyplatform-python-debug0:3.6.8-73.el8_10.i686platform-python-debug-0:3.6.8-73.el8_10.i686.noarch.rpm
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03 Jul 2026 00:38Current
5.7Medium risk
Vulners AI Score5.7
CVSS 45.9
EPSS0.00463
SSVC
CWE-74
pythonwsgiref headersnewline injectionheader filteringweb headers
8