7-Zip

CVE-2026-125742: 7-Zip before 26.06 contains a heap out-of-bounds write vulnerability in the LZX decoder that lets attackers corrupt memory when a continuation CAB volume declar

CVE-2026-125742 Nov 10, 2026 Source: Vendor

7-Zip before 26.06 contains a heap out-of-bounds write vulnerability in the LZX decoder that lets attackers corrupt memory when a continuation CAB volume declares a smaller window. Attackers can entice victims to extract crafted multi-volume CAB archives, where a stale _pos value bypasses bounds checks, enabling arbitrary code execution.

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-125742

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Credited

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CVE-2026-125742 BR2026-0000-044201 unclaimed

Credited as Nguyễn Trần Thanh Lâm of Nanyang Technological University, and other researchers who wished to remain anonymous