{"id":"UBUNTU-CVE-2026-48103","details":"7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId \u003e= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe's ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.","modified":"2026-06-12T09:04:20.091050154Z","published":"2026-06-05T17:16:00Z","upstream":["CVE-2026-48103"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-48103"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-48103"},{"type":"REPORT","url":"https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"}],"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_name":"p7zip","binary_version":"9.20.1~dfsg.1-4+deb7u3build0.14.04.1"},{"binary_version":"9.20.1~dfsg.1-4+deb7u3build0.14.04.1","binary_name":"p7zip-full"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48103.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_version":"9.20.1~dfsg.1-4.2ubuntu0.1","binary_name":"p7zip-full"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48103.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-2026-48103.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-2026-48103.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_name":"p7zip","binary_version":"16.02+dfsg-8"},{"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-2026-48103.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-2026-48103.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_name":"7zip-standalone","binary_version":"23.01+dfsg-11ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48103.json"}},{"package":{"name":"7zip","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/7zip?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["24.09+dfsg-7","24.09+dfsg-8","25.00+dfsg-1","25.01+dfsg-1","25.01+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"25.01+dfsg-2","binary_name":"7zip"},{"binary_name":"7zip-standalone","binary_version":"25.01+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48103.json"}},{"package":{"name":"7zip","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/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