CVE-2026-6666

MEDIUMNVD 5.95.9—

5.9

A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.

CVSS v3: 5.9
EG Score: 5.9(high)
EPSS: 4.5%
KEV: Not listed

Published

May 9, 2026

Last Modified

May 14, 2026

Advisory Details (1)

Auto-updated May 9, 2026

No patch confirmed yet.

generic

PgBouncer changelog

https://www.pgbouncer.org/changelog.html#pgbouncer-125x

Vendor Advisories for CVE-2026-6666(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-6666
Microsoft Security Response Center (MSRC)
PgBouncer crash in kill_pool_logins_server_error

Frequently asked(5)

What is CVE-2026-6666?

CVE-2026-6666 is a medium vulnerability published on May 9, 2026. A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error response without SQLSTATE field.

When was CVE-2026-6666 disclosed?

CVE-2026-6666 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-2026-6666 actively exploited?

CVE-2026-6666 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-6666?

CVE-2026-6666 has a CVSS v3 base score of 5.9 (NVD).

How do I remediate CVE-2026-6666?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6666, 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

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CVE-2026-6666

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

PgBouncer changelog

📣 Vendor Advisories for CVE-2026-6666(1)

❓ Frequently asked(5)