RARLAB WinRAR/RAR/UnRAR/UnRAR.dll up to 7.22 recvol5.cpp RecVolumes5::ReadHeader out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in RARLAB WinRAR, RAR, UnRAR and UnRAR.dll up to 7.22. This affects the function RecVolumes5::ReadHeader of the file recvol5.cpp. Executing a manipulation can lead to out-of-bounds write. This vulnerability appears as CVE-2026-14191. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in RARLAB WinRAR, RAR, UnRAR and UnRAR.dll up to 7.22 and classified as critical. This vulnerability affects the function RecVolumes5::ReadHeader of the file recvol5.cpp. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented by Arjun Basnet. The advisory is available at rarlab.com. This vulnerability was named CVE-2026-14191 since 06/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 7.23 eliminates this vulnerability.

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Productinfo

Type

• File Compression Software

Vendor

• RARLAB

Name

• RAR
• UnRAR
• UnRAR.dll
• WinRAR

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6
• 7.7
• 7.8
• 7.9
• 7.10
• 7.11
• 7.12
• 7.13
• 7.14
• 7.15
• 7.16
• 7.17
• 7.18
• 7.19
• 7.20
• 7.21
• 7.22

CPE 2.3info

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• 🔒
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CPE 2.2info

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• 🔒
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