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CVE-2026-107348

CVE-2026-107348 · Integer overflow causes an infinite loop in message buffer growth in PgBouncer

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.9 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • pgbouncer

    Versions
    • ≥ 1.21.0, < 1.26.1: Affected (semver)

    Update to 1.26.1

  • pgbouncer Debian:12

    Versions
    • 1.18.0-1
    • 1.18.0-1+deb12u1
    • 1.19.0-1
    • 1.19.1-1
    • 1.20.0-1
    • 1.20.1-1
    • 1.21.0-1
    • 1.22.0-1
    • 1.22.1-1
    • 1.23.0-1
    • 1.23.1-1
    • 1.24.0-2
    • 1.24.0-3
    • 1.24.1-1
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.1-1
    • 1.25.2-1
    • 1.26.0-1
    • 1.26.0-2
    • 1.26.0-3
    • 1.26.0-4
    • 1.26.0-5
    • 1.26.0-6
    • 1.26.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Debian:13

    Versions
    • 1.24.1-1
    • 1.24.1-1+deb13u1
    • 1.24.1-1+deb13u2
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.1-1
    • 1.25.2-1
    • 1.26.0-1
    • 1.26.0-2
    • 1.26.0-3
    • 1.26.0-4
    • 1.26.0-5
    • 1.26.0-6
    • 1.26.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Debian:14

    Versions
    • 1.24.1-1
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.1-1
    • 1.25.2-1
    • 1.26.0-1
    • 1.26.0-2
    • 1.26.0-3
    • 1.26.0-4
    • 1.26.0-5
    • 1.26.0-6
    Affected ranges
    • ECOSYSTEM: < 1.26.1-1

    Update to 1.26.1-1

  • pgbouncer Ubuntu:16.04:LTS

    Versions
    • 1.5.5-1
    • 1.6.1-1
    • 1.7-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:18.04:LTS

    Versions
    • 1.7.2-3build1
    • 1.7.2-65-g2b8e6cf-1
    • 1.8.1-1
    • 1.8.1-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:20.04:LTS

    Versions
    • 1.10.0-1
    • 1.10.0-1build1
    • 1.11.0-1
    • 1.12.0-2
    • 1.12.0-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:22.04:LTS

    Versions
    • 1.15.0-1
    • 1.16.1-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:24.04:LTS

    Versions
    • 1.20.0-1
    • 1.21.0-1
    • 1.22.0-1
    • 1.22.0-1build1
    • 1.22.0-1build3
    • 1.22.0-1build4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:26.10

    Versions
    • 1.25.1-1
    • 1.25.2-1
    • 1.25.2-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pgbouncer Ubuntu:26.04:LTS

    Versions
    • 1.24.1-1
    • 1.25.0-2
    • 1.25.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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