Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 28.9%
CVSS Severity
CVSS v3 Score 8.1
Products affected by CVE-2026-6665
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cpe:2.3:a:pgbouncer:pgbouncer:1.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.3
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.4
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.5
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.6
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.7
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cpe:2.3:a:pgbouncer:pgbouncer:1.0.8
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cpe:2.3:a:pgbouncer:pgbouncer:1.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.1.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.1.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.10.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.11.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.12.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.13.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.14.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.15.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.16.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.16.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.17.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.18.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.19.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.19.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.2.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.2.3
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cpe:2.3:a:pgbouncer:pgbouncer:1.20.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.20.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.21.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.22.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.22.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.23.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.23.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.24.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.24.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.25.0
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cpe:2.3:a:pgbouncer:pgbouncer:1.25.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.3
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cpe:2.3:a:pgbouncer:pgbouncer:1.3.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.3.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.3.3
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cpe:2.3:a:pgbouncer:pgbouncer:1.3.4
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cpe:2.3:a:pgbouncer:pgbouncer:1.4
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cpe:2.3:a:pgbouncer:pgbouncer:1.4.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.4.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.5
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cpe:2.3:a:pgbouncer:pgbouncer:1.5.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.5.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.5.3
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cpe:2.3:a:pgbouncer:pgbouncer:1.5.4
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cpe:2.3:a:pgbouncer:pgbouncer:1.5.5
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cpe:2.3:a:pgbouncer:pgbouncer:1.6
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cpe:2.3:a:pgbouncer:pgbouncer:1.6.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.7
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cpe:2.3:a:pgbouncer:pgbouncer:1.7.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.7.2
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cpe:2.3:a:pgbouncer:pgbouncer:1.8
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cpe:2.3:a:pgbouncer:pgbouncer:1.8.1
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cpe:2.3:a:pgbouncer:pgbouncer:1.9.0