{"id":"CVE-2026-118673","aliases":["DEBIAN-CVE-2026-118673","EUVD-2026-113213","GHSA-3448-gh8j-3227","UBUNTU-CVE-2026-118673"],"status":"published","title":"KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses","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.","severity":{"version":"4.0","score":4.1,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00115,"percentile":0.0156,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2026-10-29T16:01:55Z","modified":"2026-11-04T06:00:06Z","fixes":[{"ecosystem":"Debian:14","package":"keepassxc","fixed_in":["2.8.0+dfsg1-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-1","2.7.10+dfsg1-2","2.7.10+dfsg1-2.1","2.7.4+dfsg.1-2","2.7.6+dfsg.1-1","2.7.7+dfsg.1-1","2.7.7+dfsg.1-1+exp1","2.7.7+dfsg.1-2","2.7.7+dfsg.1-3","2.7.7+dfsg.1-3~exp1","2.7.9+dfsg1-1","2.8.0+dfsg1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-1","2.7.10+dfsg1-2","2.7.10+dfsg1-2.1","2.8.0+dfsg1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.0+dfsg1-1"}]}],"versions":["2.7.10+dfsg1-1","2.7.10+dfsg1-2","2.7.10+dfsg1-2.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"keepassxc","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"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.3+dfsg.1-1","2.4.3+dfsg.1-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.6+dfsg.1-1~exp1","2.6.6+dfsg.1-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"keepassxc","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"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-2ubuntu1","2.7.10+dfsg1-2.1","2.7.10+dfsg1-2.1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"keepassxc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7.10+dfsg1-1","2.7.10+dfsg1-2","2.7.10+dfsg1-2ubuntu1"]}],"products":[{"vendor":"keepassxc","product":"keepassxc"},{"vendor":"keepassxreboot","product":"keepassxc"}],"references":[{"url":"https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227","tags":["x_refsource_CONFIRM","exploit","advisory","report"]},{"url":"https://github.com/keepassxreboot/keepassxc/pull/13679","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa","tags":["x_refsource_MISC","fix","report"]},{"url":"https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118673.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118673","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-118673","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-118673","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-118673","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-118673","title":"KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses","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.","status":"published","published":"2026-10-29T16:01:55.635Z","modified":"2026-11-03T16:32:32.671Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-03T17:29:02.209656Z"}],"euvd":[{"id":"EUVD-2026-113213","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.","status":"published","published":"2026-10-29T16:01:55Z","modified":"2026-11-03T16:32:32Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium"}],"updated_at":"2026-11-03T18:19:04.847003Z"}],"nvd":[{"id":"CVE-2026-118673","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.","status":"published","published":"2026-10-29T16:18:03.873Z","modified":"2026-11-03T17:17:58.77Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-03T20:18:18.319452Z"}],"osv":[{"id":"CVE-2026-118673","title":"KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses","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.","status":"published","published":"2026-10-29T16:01:55.635Z","modified":"2026-11-05T07:59:47.622007933Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium"}],"cwes":["CWE-787"],"updated_at":"2026-11-05T09:08:14.330889Z"},{"id":"DEBIAN-CVE-2026-118673","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.","status":"published","published":"2026-10-29T16:18:03.873Z","modified":"2026-11-04T09:47:34.164912074Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium"}],"updated_at":"2026-11-04T10:05:32.187009Z"},{"id":"UBUNTU-CVE-2026-118673","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.","status":"published","published":"2026-10-29T16:18:00Z","modified":"2026-11-05T04:42:51Z","cvss":[{"version":"4.0","score":4.1,"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","level":"medium"}],"updated_at":"2026-11-05T13:33:25.727744Z"}]}}