{"id":"USN-8809-1","summary":"libgit2 vulnerability","details":"Kazuma Matsumoto and Isabel Mill discovered that libgit2 incorrectly\nhandled certain repository URLs when using the SSH transport. A remote\nattacker could possibly use this issue to execute arbitrary commands.","modified":"2026-09-24T07:42:29.904469152Z","published":"2026-09-23T18:29:41Z","related":["UBUNTU-CVE-2026-5917"],"upstream":["CVE-2026-5917","UBUNTU-CVE-2026-5917"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8809-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5917"}],"affected":[{"package":{"name":"libgit2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.24.1-2ubuntu0.2+esm4"}]}],"versions":["0.22.2-2","0.23.1-1","0.24.1-2","0.24.1-2ubuntu0.2","0.24.1-2ubuntu0.2+esm1","0.24.1-2ubuntu0.2+esm2","0.24.1-2ubuntu0.2+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"libgit2-24","binary_version":"0.24.1-2ubuntu0.2+esm4"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-5917","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json"}},{"package":{"name":"libgit2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.26.0+dfsg.1-1.1ubuntu0.2+esm3"}]}],"versions":["0.25.1+really0.24.6-1","0.26.0+dfsg.1-1.1","0.26.0+dfsg.1-1.1build1","0.26.0+dfsg.1-1.1ubuntu0.2","0.26.0+dfsg.1-1.1ubuntu0.2+esm1","0.26.0+dfsg.1-1.1ubuntu0.2+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libgit2-26","binary_version":"0.26.0+dfsg.1-1.1ubuntu0.2+esm3"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2026-5917","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json"}},{"package":{"name":"libgit2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.28.4+dfsg.1-2ubuntu0.1+esm2"}]}],"versions":["0.27.7+dfsg.1-0.2build1","0.28.3+dfsg.1-1","0.28.3+dfsg.1-1ubuntu1","0.28.4+dfsg.1-2","0.28.4+dfsg.1-2ubuntu0.1","0.28.4+dfsg.1-2ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libgit2-28","binary_version":"0.28.4+dfsg.1-2ubuntu0.1+esm2"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5917"}]}}},{"package":{"name":"libgit2","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.0+dfsg.1-4.1ubuntu0.1+esm2"}]}],"versions":["1.1.0+dfsg.1-4","1.1.0+dfsg.1-4.1","1.1.0+dfsg.1-4.1build1","1.1.0+dfsg.1-4.1ubuntu0.1","1.1.0+dfsg.1-4.1ubuntu0.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libgit2-1.1","binary_version":"1.1.0+dfsg.1-4.1ubuntu0.1+esm2"},{"binary_name":"libgit2-fixtures","binary_version":"1.1.0+dfsg.1-4.1ubuntu0.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:22.04:LTS","cves":[{"id":"CVE-2026-5917","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libgit2","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.2+ds-1ubuntu3.2"}]}],"versions":["1.5.1+ds-1ubuntu1","1.7.1+ds-2ubuntu1","1.7.2+ds-1ubuntu1","1.7.2+ds-1ubuntu2","1.7.2+ds-1ubuntu3","1.7.2+ds-1ubuntu3.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libgit2-1.7","binary_version":"1.7.2+ds-1ubuntu3.2"},{"binary_name":"libgit2-fixtures","binary_version":"1.7.2+ds-1ubuntu3.2"}],"availability":"No 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