CVE-2026-86776

KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size

Published Sep 9, 2026 CVSS 4.0 · 4.6 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 10, 2026, 2:58 PM
Reserved
Sep 8, 2026, 11:35 AM
Status
Deferred
Published
Sep 9, 2026, 10:22 AM
Modified
Sep 10, 2026, 7:58 PM