Home/CVE/The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the conten
CVE

CVE-2026-6665

The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the conten

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.

HIGH · CVSS 8.1 EPSS 0.0002
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-121Stack-based Buffer Overflow
▤

Affected Products & Versions

1
pgbouncer< 1.25.2
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 May 2026 · 01:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
msrcCVE-2026-6665
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.pgbouncer.org/changelog.html#pgbouncer-125xRelease Notes
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