{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53585","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-09T19:11:53.484Z","datePublished":"2026-08-20T18:37:44.115Z","dateUpdated":"2026-08-25T15:21:43.819Z"},"containers":{"cna":{"title":"libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header","problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","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:L","version":"3.1"}}],"references":[{"name":"https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"},{"name":"https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30"},{"name":"https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae"},{"name":"https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed","tags":["x_refsource_MISC"],"url":"https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed"},{"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":"2026-08-20T18:37:44.115Z"},"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, git_delta_apply in src/libgit2/delta.c trusts the attacker-controlled res_sz value parsed by hdr_sz from a delta object header and passes that amount to git__malloc before validating delta instructions. Malicious pack data supplied through git_clone, git_fetch, git_remote_fetch, git_indexer_append, or a local attacker-supplied repository can use a very small multi-level OFS_DELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5."}],"source":{"advisory":"GHSA-27m5-gxxh-x79j","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T15:21:18.543141Z","id":"CVE-2026-53585","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":"2026-08-25T15:21:43.819Z"}}]}}