Vulnerability DatabaseCVE-2026-6665
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CVE-2026-6665
Published:May 09, 2026
Updated:May 16, 2026
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.
Affected Packages
https://github.com/pgbouncer/pgbouncer.git (GITHUB):
Affected version(s) >=pgbouncer_1_0 <pgbouncer_1_25_2
Fix Suggestion:
Update to version pgbouncer_1_25_2
Related Resources (1)
https://www.pgbouncer.org/changelog.html#pgbouncer-125x
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CVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Stack-based Buffer Overflow
CWE-121
EPSS
Base Score:
0.02