Memory Exhaustion Vulnerability in KeePass by Dominik Reichl
CVE-2026-86776

4.6MEDIUM

Key Information:

Vendor

Keepass

Status
Keepass
Vendor
CVE Published:
9 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86776?

The KeePass password manager, specifically versions 2.35 through 2.61.1, contains a vulnerability that stems from inadequate validation of KDBX header field sizes during memory allocation. This flaw allows attackers to create specially crafted KDBX files that specify excessively large header field lengths. When the affected application processes such files, it may allocate vast amounts of memory, potentially leading to resource exhaustion and application crashes. Users are encouraged to update to the latest version to mitigate this risk.

Affected Version(s)

KeePass 2.35 <= 2.61.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86776 - Proof of Concept

References

https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC
exploittechnical-description
https://keepass.info/
product
https://keepass.info/download.html
product

CVSS V4

Score:
4.6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

KSecur1ty
.