| Name | CVE-2026-63209 |
| Description | compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7. |
| 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) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| golang-github-klauspost-compress (PTS) | bookworm | 1.15.12+ds1-3 | fixed |
| trixie | 1.18.0+ds1-1 | vulnerable | |
| forky, sid | 1.20.0+ds1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| golang-github-klauspost-compress | source | bookworm | (not affected) | |||
| golang-github-klauspost-compress | source | (unstable) | 1.19.0+ds1-1 |
[trixie] - golang-github-klauspost-compress <no-dsa> (Minor issue)
[bookworm] - golang-github-klauspost-compress <not-affected> (Vulnerable code introduced in 1.16.0)
https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
Introduced with: https://github.com/klauspost/compress/commit/5a210a09735ab4af7b0af4a0ec6d6dd09675526a (v1.16.0)
Fixed by: https://github.com/klauspost/compress/commit/bb2723d55de85353fd5a1817cbc382997a6a75aa (v1.19.0)
Fixed by: https://github.com/klauspost/compress/commit/8668e357e776d5152ed62f33c17f21b8690664fa (v1.18.7)