{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-14191: WinRAR / UnRAR RAR5 recovery-volume (.rev) out-of-bounds heap write in RecVolumes5::ReadHeader","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-14191","status":"final","version":"1","initial_release_date":"2026-07-01T02:41:39.316Z","current_release_date":"2026-07-01T02:42:05.524Z","revision_history":[{"date":"2026-07-01T02:41:39.316Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-14191 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-14191"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-14191"},{"category":"external","summary":"WinRAR / RAR 7.23 download (fixed release, 2026-06-30)","url":"https://www.rarlab.com/download.htm"},{"category":"external","summary":"CVE-2023-40477 - Sibling RAR3-path vulnerability fixed in WinRAR 6.23","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40477"}]},"product_tree":{"branches":[{"category":"vendor","name":"RARLAB","branches":[{"category":"product_name","name":"WinRAR","branches":[{"category":"product_version_range","name":"<7.23","product":{"name":"RARLAB WinRAR <7.23","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:rarlab:winrar:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"RARLAB","branches":[{"category":"product_name","name":"RAR","branches":[{"category":"product_version_range","name":"<7.23","product":{"name":"RARLAB RAR <7.23","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:rarlab:rar:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"RARLAB","branches":[{"category":"product_name","name":"UnRAR","branches":[{"category":"product_version_range","name":"<=7.21","product":{"name":"RARLAB UnRAR <=7.21","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:rarlab:unrar:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"RARLAB","branches":[{"category":"product_name","name":"UnRAR.dll","branches":[{"category":"product_version_range","name":"<7.23","product":{"name":"RARLAB UnRAR.dll <7.23","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:rarlab:unrar.dll:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-14191","title":"WinRAR / UnRAR RAR5 recovery-volume (.rev) out-of-bounds heap write in RecVolumes5::ReadHeader","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 7.23.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4"],"url":"https://www.rarlab.com/download.htm"}]}]}