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CVE-2026-86776

KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size

CVSS 3.1 3.3 LOWCVSS 4.0 4.6 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86776

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86776

Published

KeePass

https://keepass.info/

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "KeePass",
                    "product": "KeePass",
                    "collectionURL": "https://keepass.info/",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "2.35",
                            "lessThanOrEqual": "2.61.1",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON