Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both unauthenticated and authenticated code paths can reach the overflow.

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:

  - Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated
    remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation
    overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single
    process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both
    unauthenticated and authenticated code paths can reach the overflow. (CVE-2026-6668)

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

  - Integer overflow in the packet buffer growth logic in PgBouncer through 1.25.2 allows an unauthenticated     remote attacker to cause a denial of service. Sufficiently large input makes the buffer size computation     overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single     process, this saturates a CPU core and stalls every pooled connection until the process is killed. Both     unauthenticated and authenticated code paths can reach the overflow. (CVE-2026-6668)

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
455345	Echo: pgbouncer: security update to 1.26.0-1	Tenable Cloud Security	Echo Local Security Checks	Local	high
455345	Echo: pgbouncer: security update to 1.26.0-1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
350240	Linux Distros Unpatched Vulnerability : CVE-2026-6668	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-6668

high

Tenable Plugins

critical

critical

critical

high

high

high