CVE-2026-6664

PgBouncer integer overflow in PgBouncer network packet parsing

At a glance

Severity: HIGH 7.5
EPSS: EPSS 0.70 % · percentile 53 (2026-10-27)
State: PUBLISHED
Published: 2026-05-09
Updated: 2026-05-11
Assigner: PostgreSQL
NVD status: Analyzed

Description

An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and can lead to a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	PostgreSQL
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 (Secondary)

Weaknesses (CWE)

CWE-190

European references

ENISA EUVD · EUVD-2026-28876
GCVE · GCVE-0-2026-6664

CERT-FR advisories

CERTFR-2026-AVI-0588 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
CERTFR-2026-AVI-0559 — Multiples vulnérabilités dans PostgreSQL PgBouncer · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:* < 1.25.2

Affected products

Product	Versions
PgBouncer	affected 0 < 1.25.2

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD