{"id":"CVE-2026-119602","aliases":["AZL-112667","AZL-112676","DEBIAN-CVE-2026-119602","EUVD-2026-113939","GHSA-xxh6-gw5r-86fm","UBUNTU-CVE-2026-119602"],"status":"published","title":"libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","severity":{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00307,"percentile":0.23709,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-908"],"published":"2026-10-30T13:18:20Z","modified":"2026-11-06T01:00:35Z","affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"clamav","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.5.4-2"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.11alpha-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1","0.11-1.1","0.11-1.1~exp1","0.11-2"]},{"source":"osv","ecosystem":"Debian:13","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1.1","0.11-2"]},{"source":"osv","ecosystem":"Debian:14","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1.1","0.11-2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"clamav","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.97.8+dfsg-1ubuntu4","0.97.8+dfsg-1ubuntu5","0.98.1+dfsg-1ubuntu4","0.98.1+dfsg-1ubuntu5","0.98.1+dfsg-2ubuntu2","0.98.1+dfsg-4ubuntu1","0.98.1+dfsg-4ubuntu1.1","0.98.5+addedllvm-0ubuntu0.14.04.1","0.98.6+dfsg-0ubuntu0.14.04.1","0.98.7+dfsg-0ubuntu0.14.04.1","0.99.2+addedllvm-0ubuntu0.14.04.1","0.99.2+addedllvm-0ubuntu0.14.04.2","0.99.3+addedllvm-0ubuntu0.14.04.1","0.99.4+addedllvm-0ubuntu0.14.04.1","0.100.1+dfsg-1ubuntu0.14.04.1","0.100.1+dfsg-1ubuntu0.14.04.2","0.100.1+dfsg-1ubuntu0.14.04.3","0.100.1+dfsg-1ubuntu0.14.04.4","0.100.2+dfsg-1ubuntu0.14.04.1","0.100.2+dfsg-1ubuntu0.14.04.2","0.100.3+dfsg-0ubuntu0.14.04.1","0.100.3+dfsg-0ubuntu0.14.04.1+esm1","0.101.4+dfsg-0ubuntu0.14.04.1+esm1","0.102.1+dfsg-0ubuntu0.14.04.1+esm1","0.102.2+dfsg-0ubuntu0.14.04.1+esm1","0.102.3+dfsg-0ubuntu0.14.04.1+esm1","0.102.4+dfsg-0ubuntu0.14.04.1+esm1","0.103.2+dfsg-0ubuntu0.14.04.1+esm1","0.103.2+dfsg-0ubuntu0.14.04.1+esm2","0.103.5+dfsg-0ubuntu0.14.04.1+esm1","0.103.6+dfsg-0ubuntu0.14.04.1+esm1","0.103.8+dfsg-0ubuntu0.14.04.1+esm1","0.103.9+dfsg-0ubuntu0.14.04.1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4-1","0.4-1ubuntu0.1~esm1","0.4-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.5-1","0.5-1ubuntu0.16.04.1","0.5-1ubuntu0.16.04.2","0.5-1ubuntu0.16.04.3","0.5-1ubuntu0.16.04.4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6-3","0.6-3ubuntu0.1","0.6-3ubuntu0.2","0.6-3ubuntu0.3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.1-1","0.10.1-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.1-2build1","0.10.1-2build2","0.10.1-2ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1","0.11-1.1","0.11-1.1build1","0.11-1.1ubuntu0.24.04.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1.1build2","0.11-1.1ubuntu0.26.10.1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libmspack","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11-1.1build1","0.11-1.1build2","0.11-1.1ubuntu0.26.04.1"]}],"products":[{"vendor":"kyz","product":"libmspack"},{"vendor":"libmspack","product":"libmspack"}],"references":[{"url":"https://github.com/kyz/libmspack/issues/60","tags":["issue-tracking","report"]},{"url":"https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276","tags":["technical-description","article"]},{"url":"https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak","tags":["third-party-advisory","advisory","report"]},{"url":"https://github.com/kyz/libmspack","tags":["product","package"]},{"url":"https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119602","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-xxh6-gw5r-86fm"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119602.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-119602","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-119602","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-119602","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-119602","title":"libmspack 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Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T13:18:20.547Z","modified":"2026-10-30T15:53:29.159Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-908"],"updated_at":"2026-11-02T14:20:10.143031Z"}],"euvd":[{"id":"EUVD-2026-113939","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T13:18:20Z","modified":"2026-10-30T15:53:29Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:59:05.913237Z"}],"ghsa":[{"id":"GHSA-xxh6-gw5r-86fm","title":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS...","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T15:34:35Z","modified":"2026-10-30T15:34:44Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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","level":"medium"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-908"],"updated_at":"2026-11-02T15:14:50.290594Z"}],"nvd":[{"id":"CVE-2026-119602","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T14:16:48.7Z","modified":"2026-10-30T16:17:49.24Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-908"],"updated_at":"2026-11-02T14:13:05.268617Z"}],"osv":[{"id":"CVE-2026-119602","title":"libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T13:18:20.547Z","modified":"2026-11-01T02:47:28.386299874Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-908"],"updated_at":"2026-11-02T15:44:57.354194Z"},{"id":"DEBIAN-CVE-2026-119602","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T14:16:48.7Z","modified":"2026-11-01T09:00:06.68071367Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/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","level":"medium"}],"updated_at":"2026-11-02T15:45:51.374409Z"},{"id":"UBUNTU-CVE-2026-119602","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T14:16:00Z","modified":"2026-11-06T01:00:35.544020612Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"low"},{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-06T01:33:05.666804Z"},{"id":"AZL-112667","title":"CVE-2026-119602 affecting package clamav 1.5.4-2","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T14:16:48Z","modified":"2026-11-05T14:17:04.918027243Z","updated_at":"2026-11-05T16:41:19.001909Z"},{"id":"AZL-112676","title":"CVE-2026-119602 affecting package libmspack 0.11alpha-1","description":"libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd-\u003eextract() to write up to 32 KiB of stale heap memory into extracted output.","status":"published","published":"2026-10-30T14:16:48Z","modified":"2026-11-05T14:17:04.859981116Z","updated_at":"2026-11-05T16:41:19.001909Z"}]}}