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No exploitation reportedFix available

CVE-2026-6665

No exploitation reported by the sources we read.

  • Published2026-05-09
  • Fixed in1.25.2
  • WeaknessCWE-121

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

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

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-2026-6665?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6665?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-2026-6665 Red Hat Product Security

    PgBouncer: PgBouncer: Arbitrary code execution or Denial of Service via SCRAM server-final-message

Full record on NVD

Fix

  1. Update Pgbouncer to 1.25.2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

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

Frequently asked questions

What is CVE-2026-6665?

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.

Is CVE-2026-6665 actively exploited?

Active exploitation of CVE-2026-6665 has not been confirmed. Its EPSS score was 0.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-6665?

CVE-2026-6665 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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