CVE-2026-19888
NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.
| CWE | CWE-476 |
| Vendor | n/a |
| Product | pgbouncer |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
n/a / PgBouncer
0 ≤ 1.25.2
Credits
Thanks to @mble for finding and reporting this issue. Independently reported by @thesecguy45. Independently reported by @umutbasal. Independently reported by @jackds-security. Independently reported by @palak-paneer. Independently reported by @shakirov-vm.