CVE-2025-1795

EUVD-2025-5930
During an address list folding when a separating comma ends up on a folded line and that line is to be unicode-encoded then the separator itself is also unicode-encoded. Expected behavior is that the separating comma remains a plan comma. This can result in the address header being misinterpreted by some mail servers.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
PSFCNA
2.3 LOW
NETWORK
HIGH
LOW
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
pythoncpython
𝑥
< 3.9.23
CNA
pythoncpython
3.10.0 ≤
𝑥
< 3.10.17
CNA
pythoncpython
3.11.0 ≤
𝑥
< 3.11.9
CNA
pythoncpython
3.12.0 ≤
𝑥
< 3.12.3
CNA
Debian logo
Debian Releases
Debian Product
Codename
pypy3
bookworm
no-dsa
bullseye
vulnerable
bullseye (security)
7.3.5+dfsg-2+deb11u5
fixed
forky
7.3.21+dfsg-4
fixed
sid
7.3.21+dfsg-4
fixed
trixie
7.3.19+dfsg-2
fixed
python3.11
bookworm
3.11.2-6+deb12u6
fixed
bookworm (security)
vulnerable
python3.13
forky
3.13.12-1
fixed
sid
3.13.12-1
fixed
trixie
3.13.5-2
fixed
python3.9
bullseye
vulnerable
bullseye (security)
3.9.2-1+deb11u6
fixed
Common Weakness Enumeration
References
https://github.com/python/cpython/commit/09fab93c3d857496c0bd162797fab816c311ee48
https://github.com/python/cpython/commit/70754d21c288535e86070ca7a6e90dcb670b8593
https://github.com/python/cpython/commit/9148b77e0af91cdacaa7fe3dfac09635c3fe9a74
https://github.com/python/cpython/commit/a4ef689ce670684ec132204b1cd03720c8e0a03d
https://github.com/python/cpython/commit/d4df3c55e4c5513947f907f24766b34d2ae8c090
https://github.com/python/cpython/issues/100884
https://github.com/python/cpython/pull/100885
https://github.com/python/cpython/pull/119099
https://mail.python.org/archives/list/security-announce@python.org/thread/MB62IZMEC3UM6SGHP5LET5JX2Y7H4ZUR/
https://lists.debian.org/debian-lts-announce/2025/03/msg00013.html