How severe is CVE-2026-6666?

CVE-2026-6666 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-6666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6666?

CVE-2026-6666 affects Pgbouncer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-6666 have an EU (EUVD) identifier?

Yes. CVE-2026-6666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28878.

When was CVE-2026-6666 published?

CVE-2026-6666 was published on 2026-05-09 and last updated on 2026-06-17.

CVE-2026-6666

CVE-2026-6666 is a medium-severity vulnerability in Pgbouncer with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28878
Weakness: CWE-476
Affected product: Pgbouncer
Published: 2026-05-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-6666?: 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.
How severe is CVE-2026-6666?: CVE-2026-6666 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-6666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6666?: CVE-2026-6666 affects Pgbouncer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6666 have an EU (EUVD) identifier?: Yes. CVE-2026-6666 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28878.
When was CVE-2026-6666 published?: CVE-2026-6666 was published on 2026-05-09 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*

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