CVE-2026-86776

4.6 mediumEPSS 0.2%

Medium (4.6). EPSS 0.2% chance of exploitation in the next 30 days.

KeePass versions 2.35 through 2.61.1 fail to validate KDBX header field sizes before memory allocation in the ReadHeaderField function. Attackers can craft a malicious KDBX file declaring excessive header field lengths to trigger allocation of gigabytes of memory, causing the application to consume resources and terminate.

Severity

CVSS 4.0

4.6 medium

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

3.3 low

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-31)
CWE: CWE-789
Published: 2026-09-09
Modified: 2026-09-10
Record from: the NVD, synced 2026-10-19

References

https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC
https://keepass.info/
https://keepass.info/download.html
https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size

Check your stack JSON