CVE catalog
CVE-2026-6668
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 co
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.57% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | pgbouncer | sid | 1.26.1-1 | fixed |
| Debian | pgbouncer | forky | 1.26.1-1 | fixed |
| Debian | pgbouncer | trixie | 1.24.1-1+deb13u2 | vulnerable |
| Debian | pgbouncer | bookworm | 1.18.0-1+deb12u1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | pgbouncer | source | sid | 1.26.0-1 | not yet assigned | Not reported | [1148946] |
| Debian | pgbouncer | source | forky | 1.26.0-1 | not yet assigned | Not reported | [1148946] |
| Debian | pgbouncer | source | trixie | (unfixed) | not yet assigned | Not reported | [1148946] |
| Debian | pgbouncer | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148946] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [pgbouncer]Affected
Details (2)
1.18.0-1+deb12u1· amd64 · bookwormAffected
nvd · pgbouncer · debian · bookworm; nvd · pgbouncer · debian · 12
1.18.0-1+deb12u1· arm64 · bookwormAffected
nvd · pgbouncer · debian · bookworm; nvd · pgbouncer · debian · 12
[Debian 13 (Trixie)]
- [pgbouncer]Affected
Details (2)
1.24.1-1+deb13u2· amd64 · trixieAffected
nvd · pgbouncer · debian · 13
1.24.1-1+deb13u2· arm64 · trixieAffected
nvd · pgbouncer · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-6668]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-6668]
- [https://security-tracker.debian.org/tracker/CVE-2026-6668]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6668.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3529.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]