Medium 4.1Published Oct 29, 2026

CVE-2026-118673KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses

Updated under an hour ago (Oct 29, 2026, 1:50 PM ET)

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It affects keepassxreboot keepassxc. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 4.1 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 29, 2026
First seen by InfoSec Signals: Oct 29, 2026

Affected products

Affected products

keepassxreboot keepassxc keepassxreboot:keepassxc (from the name)	from 2.3.0, < 2.8.0	CNA record

References

References

https://github.com/keepassxreboot/keepassxc/security/advisories/GHSA-3448-gh8j-3227	x-refsource-confirm
https://github.com/keepassxreboot/keepassxc/pull/13679	x-refsource-misc
https://github.com/keepassxreboot/keepassxc/commit/80e68bb4e8b89e383dd96b1bf5de169ca61367aa	x-refsource-misc
https://github.com/keepassxreboot/keepassxc/releases/tag/2.8.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.