{"affected":[{"product":"keepassxc","source":"CNA: GitHub_M","vendor":"keepassxreboot","versions":[{"status":"affected","version":">= 2.3.0, < 2.8.0"}]}],"cveId":"CVE-2026-118673","cwes":["CWE-787"],"description":"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.","epss":{"date":"2026-11-04","percentile":0.01554,"score":0.00115},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"}],"kev":null,"metrics":[{"score":4.1,"severity":"medium","source":"CNA: GitHub_M","vector":"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","version":"4.0"},{"score":4.1,"severity":"medium","source":"NVD: security-advisories@github.com","vector":"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/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","version":"4.0"}],"modifiedAt":1793726278770,"publishedAt":1793289715635,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/keepassxreboot/keepassxc/pull/13679"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/keepassxreboot/keepassxc/pull/13679"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0"},{"source":"security-advisories@github.com","tags":[],"url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":[],"url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227"}],"remediation":[],"revision":"8679a05191610a3d8ea904437eeba2fd738652dfb735803ed92fef850027a792","sources":[{"modifiedAt":1793723552671,"name":"CNA: GitHub_M","retrievedAt":1793725816175,"url":"https://www.cve.org/CVERecord?id=CVE-2026-118673"},{"modifiedAt":1793726278770,"name":"NVD","retrievedAt":1793729916405,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118673"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793858208526,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-118673"}],"ssvc":{"assessedAt":1793723440960,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses","updatedAt":1793858208526}