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{"bugzilla": {"description": "pgbouncer: pgbouncer: Denial of Service via empty parameter name in startup options", "id": "2552735", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552735"}, "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-835", "details": ["A flaw was found in PgBouncer. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending a startup message that contains an empty parameter name in its options. This causes PgBouncer to enter an infinite loop during startup parameter processing, consuming high CPU resources and rendering the service unresponsive to all clients until restarted."], "mitigation": {"lang": "en:us", "value": "Restrict network access to the PgBouncer service so that only trusted application hosts and administrative clients can connect. This can be accomplished by configuring firewall filtering using firewalld or by binding PgBouncer only to internal, isolated interfaces.\nFor example, to restrict access to PgBouncer (default port 6432/TCP) to a trusted subnet (such as 192.168.1.0/24):\n1. Add a rich rule allowing only the trusted source subnet:\n# firewall-cmd --permanent --add-rich-rule='rule family=\"ipv4\" source address=\"192.168.1.0/24\" port port=\"6432\" protocol=\"tcp\" accept'\n2. Ensure the port is not exposed in public zones:\n# firewall-cmd --permanent --remove-port=6432/tcp\n3. Reload firewalld to apply changes:\n# firewall-cmd --reload\nCaveats: Network-level restrictions reduce exposure to untrusted external clients but do not mitigate risks originating from compromised or untrusted hosts within the allowed network. Modifying firewall rules or listener configurations can momentarily disrupt active client sessions and connection pooling."}, "name": "CVE-2026-107349", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "pgbouncer", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-14T17:34:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-107349\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-107349\nhttps://www.pgbouncer.org/changelog.html"], "threat_severity": "Important"}

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