{"id":"UBUNTU-CVE-2026-104086","details":"7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user.","modified":"2026-10-17T12:58:42.910216971Z","published":"2026-10-15T00:00:00Z","upstream":["CVE-2026-104086"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-104086"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-104086"},{"type":"REPORT","url":"https://7-zip.org/"},{"type":"REPORT","url":"https://sourceforge.net/p/sevenzip/discussion/45797/thread/db6922e1d0/"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/7-zip-squashfs-uninitialized-memory-disclosure-via-uid-gid-table"}],"affected":[{"package":{"name":"p7zip","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.20.1~dfsg.1-4","9.20.1~dfsg.1-4+deb7u1build0.14.04.1","9.20.1~dfsg.1-4+deb7u2build0.14.04.1","9.20.1~dfsg.1-4+deb7u3build0.14.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"9.20.1~dfsg.1-4+deb7u3build0.14.04.1","binary_name":"p7zip"},{"binary_name":"p7zip-full","binary_version":"9.20.1~dfsg.1-4+deb7u3build0.14.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"p7zip","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.20.1~dfsg.1-4.2","9.20.1~dfsg.1-4.2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"9.20.1~dfsg.1-4.2ubuntu0.1","binary_name":"p7zip"},{"binary_name":"p7zip-full","binary_version":"9.20.1~dfsg.1-4.2ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"p7zip","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.02+dfsg-4","16.02+dfsg-5","16.02+dfsg-6"],"ecosystem_specific":{"binaries":[{"binary_name":"p7zip","binary_version":"16.02+dfsg-6"},{"binary_name":"p7zip-full","binary_version":"16.02+dfsg-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"p7zip","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.02+dfsg-7","16.02+dfsg-7build1"],"ecosystem_specific":{"binaries":[{"binary_name":"p7zip","binary_version":"16.02+dfsg-7build1"},{"binary_name":"p7zip-full","binary_version":"16.02+dfsg-7build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"p7zip","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.02+dfsg-8"],"ecosystem_specific":{"binaries":[{"binary_version":"16.02+dfsg-8","binary_name":"p7zip"},{"binary_name":"p7zip-full","binary_version":"16.02+dfsg-8"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"7zip","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/7zip?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["21.03~beta+dfsg-6","21.04~beta+dfsg-1","21.06+dfsg-1","21.07+dfsg-1","21.07+dfsg-2","21.07+dfsg-3","21.07+dfsg-4","21.07+dfsg-4ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"7zip","binary_version":"21.07+dfsg-4ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"p7zip","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/p7zip?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["16.02+dfsg-8","16.02+transitional.1"],"ecosystem_specific":{"binaries":[{"binary_version":"16.02+transitional.1","binary_name":"p7zip"},{"binary_version":"16.02+transitional.1","binary_name":"p7zip-full"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104086.json"}},{"package":{"name":"7zip","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/7zip?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.01+dfsg-3","23.01+dfsg-7","23.01+dfsg-8","23.01+dfsg-11","23.01+dfsg-11ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"23.01+dfsg-11ubuntu0.1~esm1","binary_name":"7zip"},{"binary_version":"23.01+dfsg-11ubuntu0.1~esm1","binary_name":"7zip-standalone"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-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