{"id":"USN-8907-1","summary":"libgit2 vulnerability","details":"It was discovered that libgit2 incorrectly handled IP address\nSubjectAltName verification in TLS certificate validation. A remote\nattacker with a CA-trusted certificate could possibly use this issue\nto perform a machine-in-the-middle attack, leading to the exposure\nof sensitive information.","modified":"2026-10-09T01:57:46.790316286Z","published":"2026-10-08T13:40:27Z","related":["UBUNTU-CVE-2026-53583"],"upstream":["CVE-2026-53583","UBUNTU-CVE-2026-53583"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8907-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-53583"}],"affected":[{"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-1ubuntu3.3"}]}],"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","1.7.2+ds-1ubuntu3.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libgit2-1.7","binary_version":"1.7.2+ds-1ubuntu3.3"},{"binary_version":"1.7.2+ds-1ubuntu3.3","binary_name":"libgit2-fixtures"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8907-1.json","cves_map":{"cves":[{"id":"CVE-2026-53583","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:24.04:LTS"}}},{"package":{"name":"libgit2","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libgit2?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.1+ds-1ubuntu1.3"}]}],"versions":["1.9.0+ds-2ubuntu2","1.9.1+ds-1ubuntu1","1.9.1+ds-1ubuntu1.1","1.9.1+ds-1ubuntu1.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.9.1+ds-1ubuntu1.3","binary_name":"libgit2-1.9"},{"binary_name":"libgit2-fixtures","binary_version":"1.9.1+ds-1ubuntu1.3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-53583","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8907-1.json"}}],"schema_version":"1.9.0"}