# CVE-2026-86776

## Summary

- **CVE ID:** CVE-2026-86776
- **Severity:** MEDIUM
- **CVSS Score:** 4.6 (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)
- **CWE:** CWE-789
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## 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.

## Affected Products

- KeePass — KeePass (2.35)

## References

- [CNA](https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC)
- [CNA](https://keepass.info/)
- [CNA](https://keepass.info/download.html)
- [CNA](https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._