CVE-2026-19888

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{"bugzilla": {"description": "pgbouncer: PgBouncer: Denial of Service via malformed SCRAM client-final-message", "id": "2539545", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539545"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in PgBouncer. Missing validation of a mandatory attribute in the SCRAM client-final-message parser allows an unauthenticated remote attacker to crash the process. By sending a malformed message, the parser can report success while a required value remains unset, leading to a NULL pointer dereference. This crash occurs before any credentials are verified and terminates all pooled connections, resulting in a Denial of Service."], "mitigation": {"lang": "en:us", "value": "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.\nExample for `pgbouncer.ini`:\n```\n[pgbouncer]\nlisten_addr = 127.0.0.1\n```\nExample for firewall (adjust port if necessary, default is 6432):\n```bash\nfirewall-cmd --permanent --zone=public --remove-port=6432/tcp\nfirewall-cmd --permanent --zone=trusted --add-source=192.168.1.0/24 --add-port=6432/tcp\nfirewall-cmd --reload\n```"}, "name": "CVE-2026-19888", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "pgbouncer", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-23T16:04:48Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19888\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19888\nhttps://www.pgbouncer.org/changelog.html"], "threat_severity": "Important"}

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