High [CVE-2026-19888] Denial of Service via malformed SCRAM client-final-message
This high-severity Red Hat Linux advisory covers CVE-2026-19888; related products: Red Hat Hardened Images.
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Summary
Denial of Service via malformed SCRAM client-final-message. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-476. Red Hat lists fixing advisory RHSA-2026:70698 with package pgbouncer-main-1.26.0-0.1.hum1.
Affected product named by the advisory: Red Hat Hardened Images.
- 1.25.2
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- pgbouncer-main-1.26.0-0.1.hum1
- RHSA-2026:70698
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict network access to the PgBouncer service to only trusted clients or localhost. This can be achieved by configuring firewall rules to limit incoming connections to the PgBouncer port or by setting the `listen_addr` parameter in the `pgbouncer.ini` configuration file to `localhost` or specific trusted IP addresses. After modifying the `pgbouncer.ini` file, the PgBouncer service must be restarted for the changes to take effect, which will temporarily disrupt existing connections. Example for `pgbouncer.ini`: ``` [pgbouncer] listen_addr = 127.0.0.1 ``` Example for firewall (adjust port if necessary, default is 6432): ```bash firewall-cmd --permanent --zone=public --remove-port=6432/tcp firewall-cmd --permanent --zone=trusted --add-source=192.168.1.0/24 --add-port=6432/tcp firewall-cmd --reload ```
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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