CVE-2025-61727

Name	CVE-2025-61727
Description	An excluded subdomain constraint in a certificate chain does not restrict the usage of wildcard SANs in the leaf certificate. For example a constraint that excludes the subdomain test.example.com does not prevent a leaf certificate from claiming the SAN *.example.com.
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)
Debian Bugs	1121847, 1121848

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
	forky, sid	1.24.9-1	vulnerable
golang-1.25 (PTS)	forky, sid	1.25.3-1	vulnerable

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

Package	Type	Release	Fixed Version	Debian Bugs
golang-1.15	source	(unstable)	(unfixed)
golang-1.19	source	(unstable)	(unfixed)
golang-1.24	source	(unstable)	(unfixed)	1121848
golang-1.25	source	(unstable)	(unfixed)	1121847

Notes

[bookworm] - golang-1.19 <no-dsa> (Minor issue)
[bullseye] - golang-1.15 <postponed> (Limited support, minor issue, follow bookworm DSAs/point-releases)
https://groups.google.com/g/golang-announce/c/8FJoBkPddm4
https://github.com/golang/go/issues/76442
Fixed by: https://github.com/golang/go/commit/287017acebd27203aa3218abbd11ed65c2280cf8 (go1.25.5)
Fixed by: https://github.com/golang/go/commit/04db77a423cac75bb82cc9a6859991ae9c016344 (go1.24.11)