{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53587","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-09T19:11:53.484Z","datePublished":"2026-08-20T18:36:43.055Z","dateUpdated":"2026-08-20T19:18:33.821Z"},"containers":{"cna":{"title":"libgit2 - Unauthenticated network-reachable heap out-of-bounds read in transports/smart_pkt.c:set_data","problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-126","lang":"en","description":"CWE-126: Buffer Over-read","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1284","lang":"en","description":"CWE-1284: Improper Validation of Specified Quantity in Input","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/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm","tags":["x_refsource_CONFIRM"],"url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm"},{"name":"https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab0db28239462a671e2e5440e","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/2c0ce8c0132ac38ab0db28239462a671e2e5440e"},{"name":"https://github.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20ad3","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/affda60c10fcef16723451c0d7dc71b71dc20ad3"},{"name":"https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7640","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/d7a9fb87f504434e9f45228678953c4fa56e7640"},{"name":"https://github.com/libgit2/libgit2/releases/tag/v1.8.6","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/releases/tag/v1.8.6"},{"name":"https://github.com/libgit2/libgit2/releases/tag/v1.9.5","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/releases/tag/v1.9.5"}],"affected":[{"vendor":"libgit2","product":"libgit2","versions":[{"version":"< 1.8.6","status":"affected"},{"version":">= 1.9.0, < 1.9.5","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-20T18:36:43.055Z"},"descriptions":[{"lang":"en","value":"libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. This issue is fixed in versions 1.8.6 and 1.9.5."}],"source":{"advisory":"GHSA-pm24-4jhq-3xvm","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-pm24-4jhq-3xvm","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-20T19:18:28.320266Z","id":"CVE-2026-53587","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-20T19:18:33.821Z"}}]}}