What is CVE-2026-86776?

CVE-2026-86776 is a low-severity vulnerability in Keepass, classified under CWE-789. CVSS score: 3.3/10. Published 2026-09-09.

How severe is CVE-2026-86776?

Low severity. CVSS v3 base score is 3.3 out of 10.

Vulnerability in Keepass

CVE-2026-86776

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.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

Keepass

Weakness classification (CWE)

CWE-789

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-86776?: CVE-2026-86776 is a low-severity vulnerability in Keepass, classified under CWE-789. CVSS score: 3.3/10. Published 2026-09-09.
How severe is CVE-2026-86776?: Low severity. CVSS v3 base score is 3.3 out of 10.