{"id":"USN-9051-1","summary":"libfcgi vulnerability","details":"It was discovered that FastCGI incorrectly handled certain parameter\nlengths, leading to an integer overflow and a heap-based buffer\noverflow. An attacker could possibly use this issue to cause\napplications using FastCGI to crash, resulting in a denial of service,\nor execute arbitrary code.","modified":"2026-11-12T17:29:26.139444989Z","published":"2026-11-11T18:27:56Z","related":["UBUNTU-CVE-2025-23016"],"upstream":["CVE-2025-23016","UBUNTU-CVE-2025-23016"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-9051-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-23016"}],"affected":[{"package":{"name":"libfcgi","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libfcgi?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0-8.3ubuntu0.1~esm1"}]}],"versions":["2.4.0-8.3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"libfcgi0ldbl","binary_version":"2.4.0-8.3ubuntu0.1~esm1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-23016","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9051-1.json"}},{"package":{"name":"libfcgi","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libfcgi?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0-10ubuntu0.18.04.1~esm1"}]}],"versions":["2.4.0-8.4","2.4.0-10"],"ecosystem_specific":{"binaries":[{"binary_name":"libfcgi-bin","binary_version":"2.4.0-10ubuntu0.18.04.1~esm1"},{"binary_name":"libfcgi0ldbl","binary_version":"2.4.0-10ubuntu0.18.04.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9051-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2025-23016","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"libfcgi","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libfcgi?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.0-10ubuntu0.20.04.1~esm1"}]}],"versions":["2.4.0-10","2.4.0-10build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libfcgi-bin","binary_version":"2.4.0-10ubuntu0.20.04.1~esm1"},{"binary_name":"libfcgi0ldbl","binary_version":"2.4.0-10ubuntu0.20.04.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2025-23016"}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9051-1.json"}}],"schema_version":"1.9.2"}