{"id":"JLSEC-2026-1371","details":"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.","modified":"2026-08-21T21:30:03.225042827Z","published":"2026-08-21T21:14:18.508Z","upstream":["CVE-2026-53585","EUVD-2026-63548"],"database_specific":{"license":"CC-BY-4.0","sources":[{"html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53585","database_specific":{"status":"Received"},"id":"CVE-2026-53585","imported":"2026-08-21T20:45:16.243Z","modified":"2026-08-20T19:16:54.837Z","published":"2026-08-20T19:16:54.837Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-53585"},{"published":"2026-08-20T18:37:44Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-63548","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-63548","affected":{"libgit2:libgit2":["1.9.0, \u003c 1.9.5","\u003c 1.8.6"]},"id":"EUVD-2026-63548","imported":"2026-08-21T20:45:01.754Z","modified":"2026-08-20T18:37:44Z"}]},"references":[{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/releases/tag/v1.8.6"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/releases/tag/v1.9.5"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"}],"affected":[{"package":{"name":"LibGit2_jll","ecosystem":"Julia","purl":"pkg:julia/LibGit2_jll?uuid=e37daf67-58a4-590a-8e99-b0245dd2ffc5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.9.6+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1371.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CNA"}]}