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TI-2026-59333 Aliases CVE-2026-86776GHSA-5r36-v86r-vm5x

KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size

Priority MEDIUM 54CWE-789Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-789.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00168 6th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KeePassKeePass2.35 – 2.61.1—No fix listedCNA
  • KeePass VendorKeePass Affected 2.35 – 2.61.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86776
  2. 2026-10-03 Alias added: GHSA-5r36-v86r-vm5x

References

Exploit 1

Other 2

  • TI-2023-16037 In KeePass 2.x before 2.54, it is possible to recover the cleartext master password from… CVSS 3.1HIGH 7.5
  • TI-2020-19313 KeePass 2.44 - Denial of Service (PoC) CVSS 4.0MEDIUM 4.6
  • TI-2022-00638 Information disclosure in keepass CVSS 3.1HIGH 7.5
  • TI-2019-14558 KeePass 2.4.1 allows CSV injection in the title field of a CSV export. CVSS 3.1HIGH 7.8
  • TI-2016-04425 The automatic update feature in KeePass 2.33 and earlier allows man-in-the-middle… CVSS 3.0HIGH 7.5
  • TI-2017-14405 The entry details view function in KeePass version 1.32 inadvertently decrypts certain… CVSS 3.0HIGH 7.5
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences