Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in this way stop it from serving traffic for every other database and client it is pooling, so the failure of a single backend is not contained.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-99030761e8 advisory.

    Update to 1.26.0.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-851c3ccde8 advisory.

    Update to 1.26.0.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-6197f5c17e advisory.

    Update to 1.26.0.

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a
    backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause
    uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend
    builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in
    this way stop it from serving traffic for every other database and client it is pooling, so the failure of
    a single backend is not contained. (CVE-2026-6669)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Missing upper bound on the key derivation iteration count accepted during SCRAM authentication to a     backend server in PgBouncer through 1.25.2 allows a malicious or compromised PostgreSQL backend to cause     uncontrolled CPU consumption in PgBouncer. The resulting key derivation cannot be interrupted in frontend     builds such as PgBouncer. Because PgBouncer serves all clients from a single process, one backend can in     this way stop it from serving traffic for every other database and client it is pooling, so the failure of     a single backend is not contained. (CVE-2026-6669)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
362934	Fedora 44 : pgbouncer (2026-99030761e8)	Nessus	Fedora Local Security Checks	Local	critical
362933	Fedora 45 : pgbouncer (2026-851c3ccde8)	Nessus	Fedora Local Security Checks	Local	critical
362927	Fedora 43 : pgbouncer (2026-6197f5c17e)	Nessus	Fedora Local Security Checks	Local	critical
455136	Echo: pgbouncer: security update to 1.26.0-1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
455136	Echo: pgbouncer: security update to 1.26.0-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
350222	Linux Distros Unpatched Vulnerability : CVE-2026-6669	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-6669

medium

Tenable Plugins

critical

critical

critical

medium

medium

medium