{"id":"USN-8292-1","summary":"libarchive vulnerabilities","details":"It was discovered that libarchive incorrectly handled certain RAR\narchives. An attacker could possibly use this issue to cause an\nout-of-bounds read via a crafted RAR archive, leading to sensitive\nmemory disclosure. (CVE-2026-4424)\n\nIt was discovered that libarchive incorrectly handled certain ISO files.\nAn attacker could possibly use this issue to cause incorrect memory\nallocation via a crafted ISO file, leading to a denial of service.\n(CVE-2026-4426)\n\nIt was discovered that libarchive incorrectly handled block pointer\nallocation in zisofs on 32-bit systems. An attacker could possibly use\nthis issue to cause a heap buffer overflow via a crafted ISO9660 image,\npossibly leading to arbitrary code execution. (CVE-2026-5121)","modified":"2026-05-21T21:32:57.062127362Z","published":"2026-05-21T14:28:35Z","related":["UBUNTU-CVE-2026-4424","UBUNTU-CVE-2026-4426","UBUNTU-CVE-2026-5121"],"upstream":["CVE-2026-4424","CVE-2026-4426","CVE-2026-5121","UBUNTU-CVE-2026-4424","UBUNTU-CVE-2026-4426","UBUNTU-CVE-2026-5121"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8292-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4424"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-4426"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5121"}],"affected":[{"package":{"name":"libarchive","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libarchive?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.2-7ubuntu2.8+esm5"}]}],"versions":["3.1.2-5ubuntu1","3.1.2-7ubuntu1","3.1.2-7ubuntu2","3.1.2-7ubuntu2.1","3.1.2-7ubuntu2.2","3.1.2-7ubuntu2.3","3.1.2-7ubuntu2.4","3.1.2-7ubuntu2.6","3.1.2-7ubuntu2.7","3.1.2-7ubuntu2.8","3.1.2-7ubuntu2.8+esm1","3.1.2-7ubuntu2.8+esm3","3.1.2-7ubuntu2.8+esm4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"bsdcpio","binary_version":"3.1.2-7ubuntu2.8+esm5"},{"binary_name":"bsdtar","binary_version":"3.1.2-7ubuntu2.8+esm5"},{"binary_name":"libarchive13","binary_version":"3.1.2-7ubuntu2.8+esm5"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4424"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4426"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5121"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8292-1.json"}},{"package":{"name":"libarchive","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libarchive?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.2-11ubuntu0.16.04.8+esm3"}]}],"versions":["3.1.2-11build1","3.1.2-11ubuntu0.16.04.1","3.1.2-11ubuntu0.16.04.2","3.1.2-11ubuntu0.16.04.3","3.1.2-11ubuntu0.16.04.4","3.1.2-11ubuntu0.16.04.5","3.1.2-11ubuntu0.16.04.6","3.1.2-11ubuntu0.16.04.7","3.1.2-11ubuntu0.16.04.8","3.1.2-11ubuntu0.16.04.8+esm1","3.1.2-11ubuntu0.16.04.8+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"bsdcpio","binary_version":"3.1.2-11ubuntu0.16.04.8+esm3"},{"binary_name":"bsdtar","binary_version":"3.1.2-11ubuntu0.16.04.8+esm3"},{"binary_name":"libarchive13","binary_version":"3.1.2-11ubuntu0.16.04.8+esm3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4424"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4426"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5121"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8292-1.json"}},{"package":{"name":"libarchive","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libarchive?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.2-3.1ubuntu0.7+esm3"}]}],"versions":["3.2.2-3.1","3.2.2-3.1ubuntu0.1","3.2.2-3.1ubuntu0.2","3.2.2-3.1ubuntu0.3","3.2.2-3.1ubuntu0.4","3.2.2-3.1ubuntu0.5","3.2.2-3.1ubuntu0.6","3.2.2-3.1ubuntu0.7","3.2.2-3.1ubuntu0.7+esm1","3.2.2-3.1ubuntu0.7+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"bsdcpio","binary_version":"3.2.2-3.1ubuntu0.7+esm3"},{"binary_name":"bsdtar","binary_version":"3.2.2-3.1ubuntu0.7+esm3"},{"binary_name":"libarchive-tools","binary_version":"3.2.2-3.1ubuntu0.7+esm3"},{"binary_name":"libarchive13","binary_version":"3.2.2-3.1ubuntu0.7+esm3"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4424"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4426"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5121"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8292-1.json"}},{"package":{"name":"libarchive","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libarchive?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.0-2ubuntu1.5+esm2"}]}],"versions":["3.4.0-1","3.4.0-1build1","3.4.0-1ubuntu2","3.4.0-2ubuntu1","3.4.0-2ubuntu1.1","3.4.0-2ubuntu1.2","3.4.0-2ubuntu1.3","3.4.0-2ubuntu1.4","3.4.0-2ubuntu1.5","3.4.0-2ubuntu1.5+esm1"],"ecosystem_specific":{"availability":"Available 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https://ubuntu.com/pro","binaries":[{"binary_name":"libarchive-tools","binary_version":"3.4.0-2ubuntu1.5+esm2"},{"binary_name":"libarchive13","binary_version":"3.4.0-2ubuntu1.5+esm2"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4424"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-4426"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-5121"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8292-1.json"}},{"package":{"name":"libarchive","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libarchive?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.0-1ubuntu1.7"}]}],"versions":["3.4.3-2","3.4.3-2build1","3.5.2-1","3.5.2-1ubuntu1","3.6.0-1ubuntu1","3.6.0-1ubuntu1.1","3.6.0-1ubuntu1.2","3.6.0-1ubuntu1.3","3.6.0-1ubuntu1.4","3.6.0-1ubuntu1.5","3.6.0-1ubuntu1.6"],"ecosystem_specific":{"availability":"No 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