CVE-2026-42504

Name	CVE-2026-42504
Description	Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-1.15 (PTS)	bullseye	1.15.15-1~deb11u4	vulnerable
golang-1.19 (PTS)	bookworm	1.19.8-2	vulnerable
golang-1.24 (PTS)	trixie	1.24.4-1	vulnerable
golang-1.25 (PTS)	forky, sid	1.25.11-1	fixed
golang-1.26 (PTS)	forky, sid	1.26.4-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
golang-1.15	source	(unstable)	(unfixed)
golang-1.19	source	(unstable)	(unfixed)
golang-1.24	source	(unstable)	(unfixed)
golang-1.25	source	(unstable)	1.25.11-1
golang-1.26	source	(unstable)	1.26.4-1

Notes

[trixie] - golang-1.24 <no-dsa> (Minor issue)
[bookworm] - golang-1.19 <no-dsa> (Minor issue)
[bullseye] - golang-1.15 <postponed> (Limited support, minor issue)
https://github.com/golang/go/issues/79217
https://github.com/golang/go/commit/7f24db453a60faf6a3546d60bb02917a0a7aace0 (go1.26.4)
https://github.com/golang/go/commit/b79e0339290e14b3b2de1dc4942b8a88701ddb02 (go1.25.11)