Integer Overflow or Wraparound and Out-of-bounds Write in compress

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-63209 · Microsoft / collected KEV context

EUVD-2026-88977

GHSA-259r-337f-4rfw

GO-2026-5841

cve-program · CVE-2026-63209

• https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
• https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536
• https://github.com/klauspost/compress/releases/tag/v1.18.7

euvd · EUVD-2026-88977

• https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
• https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536
• https://github.com/klauspost/compress/releases/tag/v1.18.7

nvd · CVE-2026-63209

• https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536
• https://github.com/klauspost/compress/releases/tag/v1.18.7
• https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw

osv · GHSA-259r-337f-4rfw

• https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
• https://nvd.nist.gov/vuln/detail/CVE-2026-63209
• https://github.com/klauspost/compress/pull/1163
• https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536
• https://github.com/klauspost/compress/commit/8668e357e776d5152ed62f33c17f21b8690664fa
• https://github.com/klauspost/compress
• https://github.com/klauspost/compress/releases/tag/v1.18.7

osv · GO-2026-5841

• https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw
• https://github.com/klauspost/compress/commit/8668e357e776d5152ed62f33c17f21b8690664fa

• 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 … · Advisory content revised · 7 Nov 2026
• 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 … · Advisory content revised · 5 Nov 2026
• 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 … · Advisory content revised · 1 Nov 2026