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Public proof of conceptFix available

CVE-2026-6664

A public proof of concept exists; no exploitation attested.

  • Published2026-05-09
  • Fixed in1.25.2
  • WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-05-0901:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6664?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6664?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Pgbouncer
BranchAffectedFixed in
1.25< 1.25.21.25.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-6664 Red Hat Product Security

    PgBouncer: PgBouncer: Denial of Service via malformed SCRAM authentication packet

Full record on NVD

Fix

  1. Update Pgbouncer to 1.25.2

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiednicolasjulian/bouncer-overflow
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-05-09
Last Modified
2026-07-24
NVD status
Analyzed
MSRC Title
PgBouncer integer overflow in PgBouncer network packet parsing

Frequently asked questions

What is CVE-2026-6664?

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.

Is CVE-2026-6664 actively exploited?

Active exploitation of CVE-2026-6664 has not been confirmed. Its EPSS score was 0.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-6664?

CVE-2026-6664 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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