Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de1
- https://github.com/keepassxreboot/keepassxc/pull/13679
- https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0
- https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3
FAQ
What is CVE-2026-118673?
CVE-2026-118673 is a documented vulnerability. 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...
How severe is CVE-2026-118673?
CVSS scoring is not yet available for CVE-2026-118673. Check NVD for updates.
Is there a patch for CVE-2026-118673?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.