{"id":"UBUNTU-CVE-2026-118673","details":"KeePassXC is a cross-platform community-driven port of the Windows application KeePass Password Safe. From 2.3.0 until 2.8.0, KeePassXC browser integration encrypts authorized responses in src/browser/BrowserMessageBuilder.cpp using a fixed 1 MiB output vector even though Botan::Sodium::crypto_box_easy() writes the plaintext length plus crypto_box_MACBYTES. A browser-protocol client that can access the per-user IPC endpoint, has a valid database association, and causes an unlocked database to generate and encrypt a sufficiently large authorized response can trigger a sequential out-of-bounds write before any response is delivered. This issue is fixed in version 2.8.0.","modified":"2026-10-31T03:30:07.357640240Z","published":"2026-10-30T00:00:00Z","upstream":["CVE-2026-118673"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-118673"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-118673"},{"type":"REPORT","url":"https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa"},{"type":"REPORT","url":"https://github.com/keepassxreboot/keepassxc/pull/13679"},{"type":"REPORT","url":"https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0"},{"type":"REPORT","url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"}],"affected":[{"package":{"name":"keepassxc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.2-1","2.2.3+dfsg.1-1","2.2.4+dfsg.1-1","2.3.0+dfsg.1-0ubuntu2","2.3.1+dfsg.1-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.1+dfsg.1-1","binary_name":"keepassxc"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}},{"package":{"name":"keepassxc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3+dfsg.1-1","2.4.3+dfsg.1-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.3+dfsg.1-1build1","binary_name":"keepassxc"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}},{"package":{"name":"keepassxc","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.6+dfsg.1-1~exp1","2.6.6+dfsg.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"keepassxc","binary_version":"2.6.6+dfsg.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}},{"package":{"name":"keepassxc","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.4+dfsg.1-2","2.7.6+dfsg.1-1","2.7.6+dfsg.1-1build2","2.7.6+dfsg.1-1build3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.7.6+dfsg.1-1build3","binary_name":"keepassxc"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}},{"package":{"name":"keepassxc","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-2ubuntu1","2.7.10+dfsg1-2.1","2.7.10+dfsg1-2.1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"keepassxc","binary_version":"2.7.10+dfsg1-2.1build1"},{"binary_version":"2.7.10+dfsg1-2.1build1","binary_name":"keepassxc-full"},{"binary_name":"keepassxc-minimal","binary_version":"2.7.10+dfsg1-2.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}},{"package":{"name":"keepassxc","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/keepassxc?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-1","2.7.10+dfsg1-2","2.7.10+dfsg1-2ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"keepassxc","binary_version":"2.7.10+dfsg1-2ubuntu1"},{"binary_name":"keepassxc-full","binary_version":"2.7.10+dfsg1-2ubuntu1"},{"binary_version":"2.7.10+dfsg1-2ubuntu1","binary_name":"keepassxc-minimal"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118673.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}