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Low severity · published Sep 9, 2026
CVE-2026-86776
KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Size
3.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
KeePass · KeePass
2.35 through 2.61.1 · source: vendor
Affected product
KE
KeePass
KeePass
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86776
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-86776
github.com
https://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POC
keepass.info
https://keepass.info/
keepass.info
https://keepass.info/download.html
www.vulncheck.com
https://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-size
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