Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV L L N N A N N L 4.6 .0017 5.5 —
AFFECTED Product Versions Fixed KeePass 2.35 – —
TIMELINE Sep 8 Reserved by VulnCheck Sep 9 Published (CNA: VulnCheck) Sep 10 EXPLOIT PUBLISHED — CVE-2026-86776 (KeePass). Public exploit reference added.
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.
| Date | Event | Detail |
|---|---|---|
| September 8, 2026 | Reserved | Reserved by VulnCheck |
| September 9, 2026 | Published | Published (CNA: VulnCheck) |
| September 10, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-86776 (KeePass). Public exploit reference added. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| KeePass | KeePass | — | 2.35 | — |
Authoritative record: CVE-2026-86776 at cve.org
Vendors: keepass
Weaknesses: CWE-789
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-86776 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
