CVE-2026-1299
email BytesGenerator header injection due to unquoted newlines
Description
The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAccess VectorNetwork
AC:LAccess ComplexityLow
Impact
C:LConfidentialityL
I:HIntegrityH
A:NAvailabilityNone
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka red hat
Python Software Foundation
oss-project·USaka psf
ООО «Ред Софт»
commercial·RUaka red soft
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
АО «СберТех»
commercial·RUaka ao sbertech, сбертех
Exploitability
Official Patch Available
References
https://github.com/python/cpython/issues/144125
github.com
https://access.redhat.com/security/cve/cve-2026-1299
access.redhat.com
https://wiki.astralinux.ru/astra-linux-se17-bulletin-2026-0421SE17
wiki.astralinux.ru
and 12 more references View all →
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