PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILL_CLIENT admin command. All users with access to the administration console (which itself requires authorization) could run this command. It would have been correct to allow only users listed in the admin_users parameter.
CVE-2026-6667
MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence
Score 4.3 from GitHub Security Advisory published 2026-05-09. NVD baseline CVSS 4.3; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 4.3
- EG Score
- 4.3(medium)
- EPSS
- 20.7%
- KEV
- Not listed
Published
May 9, 2026
Last Modified
May 14, 2026
Advisory Details (1)
Auto-updated May 9, 2026No patch confirmed yet.
Vendor Advisories for CVE-2026-6667(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2026-6667?
CVE-2026-6667 is a medium vulnerability published on May 9, 2026. PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILLCLIENT admin command. All users with access to the administration console (which itself requires authorization) could run this command. It would have been correct to allow only users listed in the adminusers…
When was CVE-2026-6667 disclosed?
CVE-2026-6667 was first published in the National Vulnerability Database on May 9, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6667 actively exploited?
CVE-2026-6667 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6667?
CVE-2026-6667 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-6667?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6667, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-6667
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