CVE-2026-6664: An integer overflow in network packet parsing code in PgBouncer before 1.25.2 bypasses a boundary check and ca

Q: How do I fix CVE-2026-6664?

pgbouncer: upgrade to 1.25.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-6664 being exploited?

CVE-2026-6664 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-6664 affect?

CVE-2026-6664 affects pgbouncer. Severity is 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 a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.

Q: How urgent is CVE-2026-6664?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-6664 is a high-severity flaw (CVSS 7.5) affecting pgbouncer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-05-09
Last modified	2026-07-24

Publisher (CNA): PostgreSQL · Vendor: pgbouncer

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-09 01:16 UTCPublished CVE record published
2026-07-24 08:10 UTCUpdated Record last modified

pgbouncer pgbouncer UPGRADE

Affected: < 1.25.2

Fixed in: 1.25.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pgbouncer || rpm -q pgbouncer || pgbouncer --version

2. UPGRADE to 1.25.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pgbouncer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pgbouncer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6664?

pgbouncer: upgrade to 1.25.2. Exact commands for each OS are on this page.

Is CVE-2026-6664 being exploited?

CVE-2026-6664 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6664 affect?

CVE-2026-6664 affects pgbouncer. Severity is 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 a crash. An unauthenticated remote attacker can crash PgBouncer with a malformed SCRAM authentication packet.

How urgent is CVE-2026-6664?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-6665 HIGH 8.1 UPGRADE The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building
CVE-2026-6666 MEDIUM 5.9 UPGRADE A possible null pointer reference in PgBouncer before 1.25.2 could lead to a crash, if a server sends an error
CVE-2026-6667 MEDIUM 4.3 UPGRADE PgBouncer before 1.25.2 did not perform an appropriate authorization check for the KILL_CLIENT admin command

References

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