Vulnerability from bitnami_vulndb
Published
2026-10-21 08:55
Modified
2026-10-21 09:15
Summary
Integer overflow causes an infinite loop in message buffer growth in PgBouncer
Details

Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows a remote attacker to cause a denial of service when max_packet_size is configured above 2147483648. A packet header declaring a length above 2^31 makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is restarted. Since 1.23.0 the overflow is reachable before authentication with a five-byte packet header.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "pgbouncer",
        "purl": "pkg:bitnami/pgbouncer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.21.0"
            },
            {
              "fixed": "1.26.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-107348"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Integer overflow in the message buffer growth logic (mbuf_make_room) in PgBouncer 1.21.0 through 1.26.0 allows a remote attacker to cause a denial of service when max_packet_size is configured above 2147483648. A packet header declaring a length above 2^31 makes the buffer size computation overflow, leaving the growth loop unable to terminate. Because PgBouncer serves all clients from a single process, this saturates a CPU core and stalls every pooled connection until the process is restarted. Since 1.23.0 the overflow is reachable before authentication with a five-byte packet header.",
  "id": "BIT-pgbouncer-2026-107348",
  "modified": "2026-10-21T09:15:38.550Z",
  "published": "2026-10-21T08:55:08.744Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107348"
    },
    {
      "type": "WEB",
      "url": "https://www.pgbouncer.org/changelog.html"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Integer overflow causes an infinite loop in message buffer growth in PgBouncer"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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