{"id":"CVE-2026-125742","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-125742","summary":"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.…","details":"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.","published":"2026-11-10T12:17:18.893","modified":"2026-11-10T12:17:19.043","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/ip7z/7zip/commit/d3296e39e1f1f92c7b41c0c3848e65640428d42d","label":"ip7z/7zip@d3296e3"},"references":[{"type":"WEB","url":"https://github.com/ip7z/7zip/blob/26.05/CPP/7zip/Compress/LzxDecoder.cpp#L1496-L1513"},{"type":"WEB","url":"https://github.com/ip7z/7zip/commit/d3296e39e1f1f92c7b41c0c3848e65640428d42d"},{"type":"WEB","url":"https://github.com/ip7z/7zip/releases/tag/26.06"},{"type":"WEB","url":"https://potion-brew.pages.dev/posts/7zip-cab-lzx-window-desync-rce/"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/7-zip-before-26.06-heap-out-of-bounds-write-via-lzx-decoder-in-cab-extraction"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-11-10T12:17:19.043"}}