{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86776","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-08T11:35:02.617Z","datePublished":"2026-09-09T10:07:26.502Z","dateUpdated":"2026-09-10T14:58:52.747Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-09T10:07:26.502Z"},"datePublic":"2026-08-13T00:00:00.000Z","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. 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."}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-789","description":"Memory Allocation with Excessive Size Value","type":"CWE"}]}],"affected":[{"vendor":"KeePass","product":"KeePass","collectionURL":"https://keepass.info/","defaultStatus":"unaffected","versions":[{"version":"2.35","lessThanOrEqual":"2.61.1","status":"affected","versionType":"custom"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:keepass:keepass:*:*:*:*:*:*:*:*","versionStartIncluding":"2.35","versionEndIncluding":"2.61.1"}]}]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW","baseScore":3.3,"baseSeverity":"LOW"}},{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":4.6,"baseSeverity":"MEDIUM"}}],"references":[{"url":"https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC","tags":["exploit","technical-description"],"name":"Reporter write-up and proof of concept"},{"url":"https://keepass.info/","tags":["product"]},{"url":"https://keepass.info/download.html","tags":["product"],"name":"KeePass 2.61.1 downloads (including source)"},{"name":"VulnCheck Advisory: KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size"}],"credits":[{"lang":"en","value":"KSecur1ty","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"},"source":{"discovery":"EXTERNAL"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-10T13:48:59.785045Z","id":"CVE-2026-86776","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-10T14:58:52.747Z"}}]}}