CVE-2026-42504

NameCVE-2026-42504
DescriptionDecoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
SourceCVE (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 PackageReleaseVersionStatus
golang-1.15 (PTS)bullseye1.15.15-1~deb11u4vulnerable
golang-1.19 (PTS)bookworm1.19.8-2vulnerable
golang-1.24 (PTS)trixie1.24.4-1vulnerable
golang-1.25 (PTS)forky, sid1.25.10-2vulnerable
golang-1.26 (PTS)forky, sid1.26.3-2vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
golang-1.15source(unstable)(unfixed)
golang-1.19source(unstable)(unfixed)
golang-1.24source(unstable)(unfixed)
golang-1.25source(unstable)(unfixed)
golang-1.26source(unstable)(unfixed)

Notes

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)
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