Description
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.
Published: 2026-09-09
Score: 4.6 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 09 Sep 2026 10:15:00 +0000

Type Values Removed Values Added
Description 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.
Title KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size
First Time appeared Keepass
Keepass keepass
Weaknesses CWE-789
CPEs cpe:2.3:a:keepass:keepass:*:*:*:*:*:*:*:*
Vendors & Products Keepass
Keepass keepass
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 4.6, 'vector': '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'}

Subscriptions

Keepass Keepass
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-09T10:07:26.502Z

Reserved: 2026-09-08T11:35:02.617Z

Link: CVE-2026-86776

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-09T10:22:33.970

Modified: 2026-09-09T10:22:33.970

Link: CVE-2026-86776

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-789

    Memory Allocation with Excessive Size Value