CVE-2026-107348

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{"bugzilla": {"description": "pgbouncer: pgbouncer: Denial of Service via integer overflow in message buffer growth", "id": "2552741", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552741"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in PgBouncer. An integer overflow in the message buffer growth logic allows a remote attacker to cause a Denial of Service (DoS) when a large maximum packet size is configured. By sending a specially crafted packet header declaring an excessively large length, an attacker can trigger an infinite loop in the buffer calculation. Because PgBouncer handles connections in a single process, this loop consumes a full CPU core and halts all pooled connections until the process is restarted."], "mitigation": {"lang": "en:us", "value": "Ensure that `max_packet_size` is not configured above 2147483647 in the PgBouncer configuration file.\n1. Edit `/etc/pgbouncer/pgbouncer.ini` and set `max_packet_size` to a safe value (or remove the directive to use standard defaults):\n```ini\n[pgbouncer]\nmax_packet_size = 2147483647\n```\n2. Reload the PgBouncer service to apply changes:\n```sh\nsystemctl reload pgbouncer\n```\nWarning: Reloading or restarting the service can disrupt ongoing administrative tasks or transient connections. Always schedule configuration reloads during standard maintenance windows.\n3. Restrict network access:\nApply firewall rules to ensure that the PgBouncer listening port (default 6432) is accessible only by trusted application hosts and not exposed to untrusted networks.\nCaveats: Setting `max_packet_size` to a lower threshold will reject legitimate queries or results exceeding that specified size."}, "name": "CVE-2026-107348", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "pgbouncer", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-14T17:34:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-107348\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-107348\nhttps://www.pgbouncer.org/changelog.html"], "threat_severity": "Moderate"}

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