{"affected":[{"defaultStatus":"unaffected","product":"7-Zip","source":"CNA: VulnCheck","vendor":"7-Zip","versions":[{"lessThan":"26.06","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-125742","cwes":["CWE-787"],"description":"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.","epss":{"date":"2026-11-12","percentile":0.07566,"score":0.00179},"exploits":[{"kind":"exploit","source":"CNA: VulnCheck","url":"https://potion-brew.pages.dev/posts/7zip-cab-lzx-window-desync-rce/"}],"kev":null,"metrics":[{"score":8.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.8,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},{"score":8.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":7.8,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1794506608977,"publishedAt":1794312056747,"references":[{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/ip7z/7zip/commit/d3296e39e1f1f92c7b41c0c3848e65640428d42d"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/ip7z/7zip/releases/tag/26.06"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/ip7z/7zip/blob/26.05/CPP/7zip/Compress/LzxDecoder.cpp#L1496-L1513"},{"source":"CNA: VulnCheck","tags":["technical-description","exploit"],"url":"https://potion-brew.pages.dev/posts/7zip-cab-lzx-window-desync-rce/"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/7-zip-before-26.06-heap-out-of-bounds-write-via-lzx-decoder-in-cab-extraction"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ip7z/7zip/blob/26.05/CPP/7zip/Compress/LzxDecoder.cpp#L1496-L1513"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ip7z/7zip/commit/d3296e39e1f1f92c7b41c0c3848e65640428d42d"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ip7z/7zip/releases/tag/26.06"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://potion-brew.pages.dev/posts/7zip-cab-lzx-window-desync-rce/"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/7-zip-before-26.06-heap-out-of-bounds-write-via-lzx-decoder-in-cab-extraction"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/ip7z/7zip/commit/d3296e39e1f1f92c7b41c0c3848e65640428d42d"}],"revision":"913d5af60fa942132c48b2f857532d2cb1df499d65b66b0bfadfb374e28b3c21","sources":[{"modifiedAt":1794506608977,"name":"CNA: VulnCheck","retrievedAt":1794510575188,"url":"https://www.cve.org/CVERecord?id=CVE-2026-125742"},{"modifiedAt":1794313039043,"name":"NVD","retrievedAt":1794336126287,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-125742"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794510584224,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-125742"}],"ssvc":{"assessedAt":1794502598968,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"7-Zip before 26.06 Heap Out-of-Bounds Write via LZX Decoder in CAB Extraction","updatedAt":1794510584224}