CVE-2026-6665
PgBouncer buffer overflow in SCRAM
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | n/a |
| Product | pgbouncer |
| Published | May 9, 2026 |
Stay Ahead of the Next One
Get instant alerts for n/a pgbouncer
Be the first to know when new high vulnerabilities affecting n/a pgbouncer are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
n/a / PgBouncer
0 < 1.25.2
References
Credits
Thanks to HarutoKimura for finding and reporting this problem.