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

🗓️ 19 May 2026 18:30:42Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 34 Views

Newline injection flaw in Python wsgiref.headers.Headers lets header names or values inject headers.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.8aarch64python3.143.14.4-2.el9_8python3.14-3.14.4-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8i686python3.143.14.4-2.el9_8python3.14-3.14.4-2.el9_8.i686.rpm
Red Hat Enterprise Linux9.8ppc64lepython3.143.14.4-2.el9_8python3.14-3.14.4-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xpython3.143.14.4-2.el9_8python3.14-3.14.4-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64python3.143.14.4-2.el9_8python3.14-3.14.4-2.el9_8.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64python3.14-debug3.14.4-2.el9_8python3.14-debug-3.14.4-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9.8i686python3.14-debug3.14.4-2.el9_8python3.14-debug-3.14.4-2.el9_8.i686.rpm
Red Hat Enterprise Linux9.8ppc64lepython3.14-debug3.14.4-2.el9_8python3.14-debug-3.14.4-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xpython3.14-debug3.14.4-2.el9_8python3.14-debug-3.14.4-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9.8x86_64python3.14-debug3.14.4-2.el9_8python3.14-debug-3.14.4-2.el9_8.x86_64.rpm
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06 Jul 2026 05:46Current
7High risk
Vulners AI Score7
CVSS 45.9
EPSS0.00463
SSVC
CWE-74
newline injectionheader vulnerabilitywsgiref headersPython
34