How severe is CVE-2026-6667?

CVE-2026-6667 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-6667 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6667?

CVE-2026-6667 affects Pgbouncer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6667?

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

Does CVE-2026-6667 have an EU (EUVD) identifier?

Yes. CVE-2026-6667 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28879.

When was CVE-2026-6667 published?

CVE-2026-6667 was published on 2026-05-09 and last updated on 2026-06-17.

CVE-2026-6667

CVE-2026-6667 is a medium-severity vulnerability in Pgbouncer with a CVSS 3.x base score of 4.3. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28879
Weakness: CWE-862
Affected product: Pgbouncer
Published: 2026-05-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-6667?: 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.
How severe is CVE-2026-6667?: CVE-2026-6667 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-6667 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6667?: CVE-2026-6667 affects Pgbouncer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6667?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6667 have an EU (EUVD) identifier?: Yes. CVE-2026-6667 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28879.
When was CVE-2026-6667 published?: CVE-2026-6667 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:*:*:*:*:*:*:*:*

More vulnerabilities in Pgbouncer

CVE-2026-6665 — High (CVSS 8.1): The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the…
CVE-2025-2291 — High (CVSS 8.1): Password can be used past expiry in PgBouncer due to auth_query not taking into account Postgres its VALID UNTIL value,…
CVE-2021-3935 — High (CVSS 8.1): When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL…
CVE-2015-6817 — High (CVSS 8.1): PgBouncer 1.6.x before 1.6.1, when configured with auth_user, allows remote attackers to gain login access as auth_user…
CVE-2026-6664 — High (CVSS 7.5): An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to…
CVE-2025-12819 — High (CVSS 7.5): Untrusted search path in auth_query connection handler in PgBouncer before 1.25.1 allows an unauthenticated attacker to…

All CVEs affecting Pgbouncer →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2026-33712 — Critical (CVSS 10.0): Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST…
CVE-2026-2031 — Critical (CVSS 10.0): An Improper Access Control vulnerability in several internal API endpoints for Google Cloud Application Integration…
CVE-2026-34976 — Critical (CVSS 10.0): Dgraph is an open source distributed GraphQL database. Prior to 25.3.1, the restoreTenant admin mutation is missing…
CVE-2025-30416 — Critical (CVSS 10.0): Sensitive data disclosure and manipulation due to missing authorization. The following products are affected: Acronis…
CVE-2025-45854 — Critical (CVSS 10.0): /server/executeExec of JEHC-BPM 2.0.1 allows attackers to execute arbitrary code via execParams.

Browse all CWE-862 (Missing Authorization) vulnerabilities →