{"id":"CVE-2026-63209","revision":"1769b7dd0fa345099411829bf13c9e02","records":[{"revision":"1769b7dd0fa345099411829bf13c9e02","observedAt":"2026-10-25T14:19:28.838+00:00","statement":{"source":"nvd","id":"CVE-2026-63209","aliases":[],"title":"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 …","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.","state":0,"publishedAt":"2026-09-29T15:17:27.13+00:00","modifiedAt":"2026-09-30T19:57:08.043+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-63209","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-190","CWE-787"],"productCriteria":[],"sourceDates":{"published":"2026-09-29T15:17:27.130","lastModified":"2026-09-30T19:57:08.043"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-63209","identifiers":["CVE-2026-63209"]},"retained":false,"historicalAffected":[]}],"coverage":[]}