CVE-2026-86776

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 5.9% of scored records. A rank, not a probability.

NVD base score

4.6 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-10.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-09 10:07Z1 MO AGO

Last updated

2026-09-10 14:58Z1 MO AGO

Reserved

2026-09-08

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Medium (CVSS 4.6)

CNA CVSS vector

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

Weaknesses

• CWE-789Memory Allocation with Excessive Size ValueVariant

Data version

5.2

Document digest

40c5047fa38aa7d362aa9aab951d3b1e28b8274e097c5d4ed3667e45134ca146

• github.comReporter write-up and proof of concepthttps://github.com/KSecur1ty/KDBX-Header-Size-Mirage-POCexploittechnical-description
• keepass.infohttps://keepass.info/product
• keepass.infoKeePass 2.61.1 downloads (including source)https://keepass.info/download.htmlproduct
• www.vulncheck.comVulnCheck Advisory: KeePass 2.35 through 2.61.1 Memory Exhaustion via KDBX Header Field Sizehttps://www.vulncheck.com/advisories/keepass-2.35-through-2.61.1-memory-exhaustion-via-kdbx-header-field-sizethird-party-advisory