{"id":"UBUNTU-CVE-2026-14191","details":"An out-of-bounds heap write exists in the RAR5 recovery-volume (.rev) parser in WinRAR and UnRAR (RecVolumes5::ReadHeader in recvol5.cpp). The RecItems vector is sized only when the first .rev file in a set is processed; subsequent .rev files supply an independent RecNum value that is validated against that file's own TotalCount field but never against the actual size of RecItems. A crafted set of two or more .rev files can therefore write an attacker-controlled 32-bit value (the header's RevCRC field) to RecItems[RecNum] at an attacker-controlled offset up to 65534 * sizeof(RecVolItem) bytes past the allocation, corrupting adjacent heap objects. Triggering requires the victim to run a recovery/test operation on an attacker-supplied .rev set (for example 'unrar t x.part1.rev', WinRAR 'Repair archive', or auto-recovery when extracting a volume set with a missing .rar part). This is the RAR5-path sibling of CVE-2023-40477 (which was fixed in the RAR3 path only in WinRAR 6.23). Fixed in WinRAR / RAR 7.23.","modified":"2026-07-01T23:38:36.038893676Z","published":"2026-07-01T04:16:00Z","upstream":["CVE-2026-14191"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-14191"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-14191"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40477"},{"type":"REPORT","url":"https://www.rarlab.com/download.htm"}],"affected":[{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:5.3.2-1","1:5.3.2-1+deb9u1build0.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"unrar","binary_version":"1:5.3.2-1+deb9u1build0.16.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:5.5.8-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:5.5.8-1","binary_name":"unrar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:5.6.6-2","1:5.6.6-2build1","1:5.6.6-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:5.6.6-2ubuntu0.1","binary_name":"libunrar5"},{"binary_version":"1:5.6.6-2ubuntu0.1","binary_name":"unrar"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.0.5-1","1:6.0.7-6","1:6.1.2-1","1:6.1.3-1","1:6.1.3-2","1:6.1.4-1","1:6.1.5-1","1:6.1.5-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libunrar-headers","binary_version":"1:6.1.5-1ubuntu0.1"},{"binary_name":"libunrar5","binary_version":"1:6.1.5-1ubuntu0.1"},{"binary_name":"unrar","binary_version":"1:6.1.5-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:6.2.10-2","1:7.0.2-1","1:7.0.3-1","1:7.0.4-1","1:7.0.5-1","1:7.0.6-1","1:7.0.7-1","1:7.0.7-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libunrar-headers","binary_version":"1:7.0.7-1build1"},{"binary_version":"1:7.0.7-1build1","binary_name":"libunrar5t64"},{"binary_name":"unrar","binary_version":"1:7.0.7-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.1.5-3","1:7.1.6-1","1:7.1.7-1","1:7.1.8-1","1:7.1.9-1","1:7.1.10-1","1:7.1.10-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libunrar-headers","binary_version":"1:7.1.10-2"},{"binary_name":"libunrar5t64","binary_version":"1:7.1.10-2"},{"binary_name":"unrar","binary_version":"1:7.1.10-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}},{"package":{"name":"unrar-nonfree","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/unrar-nonfree?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:7.1.10-2","1:7.2.1-1","1:7.2.2-1","1:7.2.3-1","1:7.2.3-2","1:7.2.4-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:7.2.4-1","binary_name":"libunrar-headers"},{"binary_name":"libunrar5t64","binary_version":"1:7.2.4-1"},{"binary_name":"unrar","binary_version":"1:7.2.4-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-14191.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}