High
unrar-nonfree — security advisory
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.
- Products
- unrar-nonfree
- Affected versions
- 1:5.3.2-1, 1:5.3.2-1+deb9u1build0.16.04.1, 1:5.5.8-1, 1:5.6.6-2, 1:5.6.6-2build1, 1:5.6.6-2ubuntu0.1, 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, 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, 1:7.1.10-1, 1:7.1.10-2, 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, 1:7.2.1-1, 1:7.2.2-1, 1:7.2.3-1, 1:7.2.3-2, 1:7.2.4-1, 1:7.2.6-1, 1:7.2.7-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-14191
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:40 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-14191
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
unrar-nonfree
Fixed versions: Not specified
Complete source record
{
"id": "d428107ee4eb77449b5c397807d2316f23c76411062277108af0b62e0c533125",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-14191",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-14191",
"summary": "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.",
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],
"modified": "2026-10-17T12:58:45.669779039Z",
"provider": "osv",
"upstream": [
"CVE-2026-14191"
],
"references": [
"https://ubuntu.com/security/CVE-2026-14191",
"https://www.cve.org/CVERecord?id=CVE-2026-14191",
"https://nvd.nist.gov/vuln/detail/CVE-2023-40477",
"https://www.rarlab.com/download.htm"
]
},
"related_cves": [
{
"value": "CVE-2026-14191",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359016,
"published_at": "2026-07-01T04:16:00+00:00"
}