{"id":"UBUNTU-CVE-2026-119602","details":"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.","modified":"2026-11-04T03:30:31.970036547Z","published":"2026-11-03T00:00:00Z","upstream":["CVE-2026-119602"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119602"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-119602"},{"type":"REPORT","url":"https://github.com/kyz/libmspack/issues/60"},{"type":"REPORT","url":"https://github.com/kyz/libmspack"},{"type":"REPORT","url":"https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276"},{"type":"REPORT","url":"https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window"}],"affected":[{"package":{"name":"clamav","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/clamav?arch=source&distro=esm-infra-legacy%2Ftrusty"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"clamav","binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1"},{"binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1","binary_name":"clamav-base"},{"binary_name":"clamav-daemon","binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1"},{"binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1","binary_name":"clamav-docs"},{"binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1","binary_name":"clamav-freshclam"},{"binary_name":"clamav-milter","binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1"},{"binary_name":"clamav-testfiles","binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1"},{"binary_name":"libclamav9","binary_version":"0.103.9+dfsg-0ubuntu0.14.04.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119602.json"}},{"package":{"name":"libmspack","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libmspack?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4-1","0.4-1ubuntu0.1~esm1","0.4-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libmspack0","binary_version":"0.4-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119602.json"}},{"package":{"name":"clamav","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/clamav?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.98.7+dfsg-0ubuntu4","0.98.7+dfsg-0ubuntu5","0.99+dfsg-1ubuntu1","0.99+dfsg-1ubuntu1.1","0.99+dfsg-1ubuntu1.2","0.99.2+dfsg-0ubuntu0.16.04.1","0.99.2+dfsg-0ubuntu0.16.04.2","0.99.2+dfsg-0ubuntu0.16.04.3","0.99.3+addedllvm-0ubuntu0.16.04.1","0.99.4+addedllvm-0ubuntu0.16.04.1","0.100.1+dfsg-1ubuntu0.16.04.1","0.100.1+dfsg-1ubuntu0.16.04.2","0.100.1+dfsg-1ubuntu0.16.04.3","0.100.2+dfsg-1ubuntu0.16.04.1","0.100.3+dfsg-0ubuntu0.16.04.1","0.101.4+dfsg-0ubuntu0.16.04.1","0.102.1+dfsg-0ubuntu0.16.04.2","0.102.2+dfsg-0ubuntu0.16.04.1","0.102.3+dfsg-0ubuntu0.16.04.1","0.102.4+dfsg-0ubuntu0.16.04.1","0.103.2+dfsg-0ubuntu0.16.04.1","0.103.2+dfsg-0ubuntu0.16.04.1+esm1","0.103.5+dfsg-0ubuntu0.16.04.1+esm1","0.103.6+dfsg-0ubuntu0.16.04.1+esm1","0.103.8+dfsg-0ubuntu0.16.04.1+esm1","0.103.9+dfsg-0ubuntu0.16.04.1+esm1","0.103.12+dfsg-0ubuntu0.16.04.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"clamav","binary_version":"0.103.12+dfsg-0ubuntu0.16.04.1+esm1"},{"binary_name":"clamav-base","binary_version":"0.103.12+dfsg-0ubuntu0.16.04.1+esm1"},{"binary_version":"0.103.12+dfsg-0ubuntu0.16.04.1+esm1","binary_name":"clamav-daemon"},{"binary_version":"0.103.12+dfsg-0ubuntu0.16.04.1+esm1","binary_name":"clamav-docs"},{"binary_version":"0.103.12+dfsg-0ubuntu0.16.04.1+esm1","binary_name":"clamav-freshclam"},{"binary_version":"0.103.12+dfsg-0ubuntu0.1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