Out-of-bounds write in keepassxc - CVE-2026-118673
Published: September 23, 2026 / Updated: November 2, 2026
Vulnerability identifier: #VU151869
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118673
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in BrowserMessageBuilder browser-integration response encryption when encrypting oversized authorized browser-integration responses. A local user can send a crafted get-logins request to cause a denial of service.
Exploitation requires access to the per-user browser IPC endpoint, a valid database association key, and an unlocked database.
Affected software
keepassxc
How to mitigate CVE-2026-118673
Install security update from vendor's website.
keepassxc - update to 2.8.0