CVE-2025-22870

Name	CVE-2025-22870
Description	Matching of hosts against proxy patterns can improperly treat an IPv6 zone ID as a hostname component. For example, when the NO_PROXY environment variable is set to "*.example.com", a request to "[::1%25.example.com]:80` will incorrectly match and not be proxied.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, 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-1.23 (PTS)	sid	1.23.8-1	fixed
golang-1.24 (PTS)	sid, trixie	1.24.2-1	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-1.23	source	(unstable)	1.23.7-1
golang-1.24	source	(unstable)	1.24.1-1

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/4t3lzH3I0eI/m/b42ImqrBAQAJ
https://github.com/golang/go/issues/71984
Fixed by: https://github.com/golang/go/commit/334de7982f8ec959c74470dd709ceedfd6dbd50a (go1.24.1)
Fixed by: https://github.com/golang/go/commit/25177ecde0922c50753c043579d17828b7ee88e7 (go1.23.7)