Vulnerability-Lookup

CVE-2026-86776 (GCVE-0-2026-86776)

Vulnerability from cvelistv5 – Published: 2026-09-09 10:07 – Updated: 2026-09-10 14:58

Title

KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size

Summary

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.

Severity

3.3 (Low)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

4.6 (Medium)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-10 13:48 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/KSecur1ty/KDBX-Header-Size-Mir…	exploittechnical-description
https://keepass.info/	product
https://keepass.info/download.html	product
https://www.vulncheck.com/advisories/keepass-2.35…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
KeePass	KeePass	Affected: 2.35 , ≤ 2.61.1 (custom) cpe:2.3:a:keepass:keepass::::::::

Date Public

2026-08-13 00:00

Credits

KSecur1ty

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86776

Vulnerability from fkie_nvd - Published: 2026-09-09 10:22 - Updated: 2026-09-10 19:58

Severity

3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC
	disclosure@vulncheck.com	https://keepass.info/
	disclosure@vulncheck.com	https://keepass.info/download.html
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://keepass.info/",
          "defaultStatus": "unaffected",
          "product": "KeePass",
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    }
  ],
  "id": "CVE-2026-86776",
  "lastModified": "2026-09-10T19:58:20.507",
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          "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": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
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        "ssvcData": {
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          "options": [
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-10T13:48:59.785045Z",
          "version": "2.0.3"
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  },
  "published": "2026-09-09T10:22:33.970",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://keepass.info/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://keepass.info/download.html"
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}

GHSA-5R36-V86R-VM5X

Vulnerability from github – Published: 2026-09-09 12:32 – Updated: 2026-09-09 12:32

Details

Severity

3.3 (Low)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

4.6 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-86776"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-789"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-09T10:22:33Z",
    "severity": "MODERATE"
  },
  "details": "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": "GHSA-5r36-v86r-vm5x",
  "modified": "2026-09-09T12:32:11Z",
  "published": "2026-09-09T12:32:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86776"
    },
    {
      "type": "WEB",
      "url": "https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC"
    },
    {
      "type": "WEB",
      "url": "https://keepass.info"
    },
    {
      "type": "WEB",
      "url": "https://keepass.info/download.html"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-86776 (GCVE-0-2026-86776)

FKIE_CVE-2026-86776

GHSA-5R36-V86R-VM5X

Tags

Sightings

Nomenclature