CVE-2026-27143

Name	CVE-2026-27143
Description	Arithmetic over induction variables in loops were not correctly checked for underflow or overflow. As a result, the compiler would allow for invalid indexing to occur at runtime, potentially leading to memory corruption.
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	1.25.9-1	fixed
golang-1.26 (PTS)	forky, sid	1.26.2-3	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)	1.25.9-1
golang-1.26	source	(unstable)	1.26.2-1

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/0uYbvbPZRWU
https://github.com/golang/go/issues/78333
Fixed by: https://github.com/golang/go/commit/c4b4bd7b3aefeb67a541912df0733bde68333bfc (go1.26.2)
Fixed by: https://github.com/golang/go/commit/7d2dd3488cdfbddda14c18c455d3263df75a46fc (go1.25.9)
https://ciolek.dev/posts/when-the-compiler-lies