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CVE-2026-14191 is an out-of-bounds heap write in the RAR5 recovery-volume parser used by WinRAR and UnRAR, specifically RecVolumes5::ReadHeader in recvol5.cpp. When the first recovery volume is processed, the parser sizes the RecItems vector. Later recovery volumes provide an independently controlled RecNum value that is checked against that file's TotalCount but is not checked against the allocated RecItems size. A crafted multi-file RAR5 recovery-volume set can consequently write the header-controlled 32-bit RevCRC value to RecItems[RecNum] beyond the vector allocation, corrupting adjacent heap objects. The issue is a RAR5-path sibling of CVE-2023-40477, whose prior fix applied only to the RAR3 path.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
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