CVE-2026-1299
email BytesGenerator header injection due to unquoted newlines
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".
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Affected products
Python Software Foundation · CPythonWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://cve.org/CVERecord?id=CVE-2024-6923https://github.com/python/cpython/commit/052e55e7d44718fe46cbba0ca995cb8fcc359413https://github.com/python/cpython/commit/0a925ab591c45d6638f37b5e57796f36fa0e56d8https://github.com/python/cpython/commit/7877fe424415bc4a13045e62a90a7277413d8cb9https://github.com/python/cpython/commit/842ce19a0c0b58d61591e8f6a708c38db1fb94e4https://github.com/python/cpython/commit/8cdf6204f4ae821f32993f8fc6bad0d318f95f36https://github.com/python/cpython/commit/e417f05ad77a4c30ddc07f99e90fc0cef43e831ahttps://github.com/python/cpython/issues/144125https://github.com/python/cpython/pull/144126https://mail.python.org/archives/list/security-announce@python.org/thread/6ZZULGALJTITEAGEXLDJE2C6FORDXPBT/