Vulnerability in KeePass (CVE-2026-86776)
Summary
Vulnerability in KeePass (CVE-2026-86776). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-86776 has been found in KeePass.
Risk of unauthorized operations or information disclosure. CVSS score: 3.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "KeePass CVE-2026-86776" on the vendor's site.
CVE-2026-86776 (KeePass) — CWE-789 / CVSS v3 3.3
Attack vector: local / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-789) exists in KeePass.
Check the vendor advisory for the affected versions of KeePass.
Severity: Low (CVSS 3.3/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'KeePass' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'KeePass' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
KeePassを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-86776 keepass2
- Ubuntu UBUNTU-CVE-2026-86776 keepass2
References
- web github.com
- web disclosure@vulncheck.com
- web keepass.info
- web vulncheck.com
- web nvd.nist.gov
- web keepass.info
- web github.com