{"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": "2026-09-09T10:07:26.502Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://keepass.info/", "defaultStatus": "unaffected", "product": "KeePass", "vendor": "KeePass", "versions": [{"lessThanOrEqual": "2.61.1", "status": "affected", "version": "2.35", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "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."}], "id": "CVE-2026-86776", "lastModified": "2026-09-09T10:22:33.970", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 3.3, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 1.4, "source": "[email protected]", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-09-09T10:22:33.970", "references": [{"source": "[email protected]", "url": "https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC"}, {"source": "[email protected]", "url": "https://keepass.info/"}, {"source": "[email protected]", "url": "https://keepass.info/download.html"}, {"source": "[email protected]", "url": "https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-789"}], "source": "[email protected]", "type": "Primary"}]}

{}

{"created": "2026-09-09T12:00:08.191216+00:00", "updated": "2026-09-09T12:00:08.191222+00:00", "vendors": []}