{"id":"CVE-2026-86776","state":"PUBLISHED","title":"KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size","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.","publishedAt":"2026-09-09T10:07:26.502Z","updatedAt":"2026-09-10T14:58:52.747Z","severity":{"score":4.6,"label":"Medium","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["KeePass KeePass"],"affected":[{"vendor":"KeePass","product":"KeePass","defaultStatus":"unaffected","versions":[{"version":"2.35","status":"affected","lessThanOrEqual":"2.61.1","versionType":"custom"}],"collectionURL":"https://keepass.info/"}],"references":["https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC","https://keepass.info/","https://keepass.info/download.html","https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86776.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86776","state":"PUBLISHED","datePublished":"2026-09-09T10:07:26.502Z","dateUpdated":"2026-09-10T14:58:52.747Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-08T11:35:02.617Z"},"containers":{"cna":{"title":"KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size","descriptions":[{"lang":"en","value":"KeePass versions 2.35 through 2.61.1 fail to validate KDBX header field sizes before memory allocation in the ReadHeaderField function. 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