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.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Active

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
KeePass KeePass unaffected
Version Status Constraints
2.35 affected ≤ 2.61.1

No data.

No data.

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Project Subscriptions

Vendors Products
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Projects

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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

Updated: 2026-09-09T12:00:08Z

Weaknesses