{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63209", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-15T22:19:06.906Z", "datePublished": "2026-09-29T14:58:53.366Z", "dateUpdated": "2026-09-29T14:58:53.366Z"}, "containers": {"cna": {"title": "Integer Overflow or Wraparound and Out-of-bounds Write in compress", "problemTypes": [{"descriptions": [{"cweId": "CWE-190", "lang": "en", "description": "CWE-190: Integer Overflow or Wraparound", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-787", "lang": "en", "description": "CWE-787: Out-of-bounds Write", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw"}, {"name": "https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536", "tags": ["x_refsource_MISC"], "url": "https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536"}, {"name": "https://github.com/klauspost/compress/releases/tag/v1.18.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/klauspost/compress/releases/tag/v1.18.7"}], "affected": [{"vendor": "klauspost", "product": "compress", "versions": [{"version": "< 1.18.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-29T14:58:53.366Z"}, "descriptions": [{"lang": "en", "value": "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": {"advisory": "GHSA-259r-337f-4rfw", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "compress", "vendor": "klauspost", "versions": [{"status": "affected", "version": "< 1.18.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-63209", "lastModified": "2026-09-29T15:17:27.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-29T15:17:27.130", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536"}, {"source": "security-advisories@github.com", "url": "https://github.com/klauspost/compress/releases/tag/v1.18.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

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