{"id":"CVE-2026-14191","state":"PUBLISHED","title":"WinRAR / UnRAR RAR5 recovery-volume (.rev) out-of-bounds heap write in RecVolumes5::ReadHeader","description":"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.","publishedAt":"2026-07-01T02:41:39.316Z","updatedAt":"2026-07-09T04:47:54.319Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"securin"},"assigner":"securin","products":["RARLAB WinRAR","RARLAB RAR","RARLAB UnRAR","RARLAB UnRAR.dll"],"affected":[{"vendor":"RARLAB","product":"WinRAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows"]},{"vendor":"RARLAB","product":"RAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows","Linux","macOS"]},{"vendor":"RARLAB","product":"UnRAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.21","versionType":"custom"}],"platforms":["Windows","Linux","macOS"]},{"vendor":"RARLAB","product":"UnRAR.dll","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows"]}],"references":["https://www.rarlab.com/download.htm","https://nvd.nist.gov/vuln/detail/CVE-2023-40477","https://www.securin.io/zero-days/cve-2026-14191-winrar-unrar-rar5-recovery-volume-rev-out-of-bounds-heap-write-in-recvolumes5-readheader"],"weaknesses":["CWE-787","CWE-129"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/14xxx/CVE-2026-14191.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-14191","state":"PUBLISHED","datePublished":"2026-07-01T02:41:39.316Z","dateUpdated":"2026-07-09T04:47:54.319Z","assignerShortName":"securin","assignerOrgId":"33c584b5-0579-4c06-b2a0-8d8329fcab9c","dateReserved":"2026-06-30T08:32:07.249Z"},"containers":{"cna":{"title":"WinRAR / UnRAR RAR5 recovery-volume (.rev) out-of-bounds heap write in RecVolumes5::ReadHeader","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"RARLAB","product":"WinRAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows"]},{"vendor":"RARLAB","product":"RAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows","Linux","macOS"]},{"vendor":"RARLAB","product":"UnRAR","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"7.21","versionType":"custom"}],"platforms":["Windows","Linux","macOS"]},{"vendor":"RARLAB","product":"UnRAR.dll","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.23","versionType":"custom"}],"platforms":["Windows"]}],"references":[{"url":"https://www.rarlab.com/download.htm","name":"WinRAR / RAR 7.23 download (fixed release, 2026-06-30)","tags":["patch","vendor-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-40477","name":"CVE-2023-40477 - Sibling RAR3-path vulnerability fixed in WinRAR 6.23","tags":["related"]},{"url":"https://www.securin.io/zero-days/cve-2026-14191-winrar-unrar-rar5-recovery-volume-rev-out-of-bounds-heap-write-in-recvolumes5-readheader"}],"metrics":[{"format":"CVSS","cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write","type":"CWE"},{"cweId":"CWE-129","lang":"en","description":"CWE-129 Improper Validation of Array Index","type":"CWE"}]}],"providerMetadata":{"shortName":"securin","orgId":"33c584b5-0579-4c06-b2a0-8d8329fcab9c","dateUpdated":"2026-07-09T04:47:54.319Z"},"credits":[{"lang":"en","value":"Arjun Basnet from Securin","type":"finder"}],"impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"Overflow Buffers - a controlled out-of-bounds heap write with attacker-controlled offset and attacker-influenced value, giving a memory-corruption primitive that can be used to crash the process (verified DoS) and, per the reporter's assessment mirroring the RAR3 sibling CVE-2023-40477, can plausibly be leveraged toward remote code execution in the context of the current user. Code execution was not demonstrated by the reporter."}]}],"timeline":[{"lang":"en","time":"2026-06-03T02:08:00.000Z","value":"Vulnerability reported to RARLAB (Eugene Roshal) by Securin"},{"lang":"en","time":"2026-06-03T20:01:00.000Z","value":"RARLAB confirmed the findings after independent source review"},{"lang":"en","time":"2026-06-30T07:51:00.000Z","value":"WinRAR / RAR 7.23 released with .rev processing fix"},{"lang":"en","time":"2026-06-30T00:00:00.000Z","value":"CVE-2026-14191 reserved by Securin CNA"}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-01T13:07:23.906784Z","id":"CVE-2026-14191","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-01T13:07:52.685Z"}}]}}}