{"id":"JLSEC-2026-1369","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, `verify_server_cert` in `src/libgit2/streams/openssl.c` uses an inverted !!memcmp result in the `GEN_IPADD` branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.","modified":"2026-08-21T21:30:03.274154849Z","published":"2026-08-21T21:14:18.508Z","upstream":["CVE-2026-53583","EUVD-2026-63549"],"database_specific":{"license":"CC-BY-4.0","sources":[{"modified":"2026-08-20T19:16:54.500Z","published":"2026-08-20T19:16:54.500Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-53583","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53583","database_specific":{"status":"Received"},"id":"CVE-2026-53583","imported":"2026-08-21T20:45:22.660Z"},{"published":"2026-08-20T18:39:03Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-63549","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-63549","affected":{"libgit2:libgit2":["1.9.0, \u003c 1.9.5","\u003c 1.8.6"]},"id":"EUVD-2026-63549","imported":"2026-08-21T20:45:01.753Z","modified":"2026-08-20T19:04:42Z"}]},"references":[{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03d"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47f"},{"type":"WEB","url":"https://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ff"},{"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-h7gc-w2gg-p9xp"}],"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-2026-1369.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:L/I:L/A:N","source":"CNA"}]}