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CVE-2026-110353

CVE-2026-110353

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

HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.

CVSS 7.5 · High · EPSS 0.7% · Fix available

Published
Updated

Stack: system · web

Affected products and versions

  • haproxy

    Versions
    • ≥ 3.2.0, < 3.2.26: Affected (custom)
    • ≥ 3.3.0, < 3.3.17: Affected (custom)
    • ≥ 3.4.0, < 3.4.6: Affected (custom)
    • ≥ 3.5-dev, < 3.5-dev9: Affected (custom)

    Update to 3.2.26; Update to 3.3.17; Update to 3.4.6; Update to 3.5-dev9

  • haproxy enterprise edition

    Versions
    • ≥ 3.2.0r1, < 3.2r1-378.1259: Affected (custom)
    • ≥ 3.3.0r1, < 3.3r1-377.1005: Affected (custom)

    No fix published

  • kubernetes ingress controller

    Versions
    • ≥ 3.2.0, < 3.2.17: Affected (custom)

    Update to 3.2.17

  • kubernetes ingress controller enterprise

    Versions
    • ≥ 3.2.0, < 3.2.17-ee1: Affected (custom)
    • ≥ 3.0, < 3.0.16-ee17: Affected (custom)
    • ≥ 1.11, < 1.11.14-ee11: Affected (custom)

    Update to 1.11.14-ee11; Update to 3.0.16-ee17; Update to 3.2.17-ee1

  • haproxy Ubuntu:Pro:16.04:LTS

    Versions
    • 1.5.14-1
    • 1.5.15-1
    • 1.6.2-1
    • 1.6.2-2
    • 1.6.2-2ubuntu1
    • 1.6.2-2ubuntu3
    • 1.6.3-1
    • 1.6.3-1ubuntu0.1
    • 1.6.3-1ubuntu0.2
    • 1.6.3-1ubuntu0.3
    • 1.6.3-1ubuntu0.3+esm1
    • 1.6.3-1ubuntu0.3+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:Pro:18.04:LTS

    Versions
    • 1.7.9-1ubuntu1
    • 1.7.9-1ubuntu2
    • 1.8.4-1
    • 1.8.7-1
    • 1.8.8-1
    • 1.8.8-1ubuntu0.1
    • 1.8.8-1ubuntu0.2
    • 1.8.8-1ubuntu0.3
    • 1.8.8-1ubuntu0.4
    • 1.8.8-1ubuntu0.6
    • 1.8.8-1ubuntu0.7
    • 1.8.8-1ubuntu0.8
    • 1.8.8-1ubuntu0.9
    • 1.8.8-1ubuntu0.10
    • 1.8.8-1ubuntu0.11
    • 1.8.8-1ubuntu0.13
    • 1.8.8-1ubuntu0.13+esm2
    • 1.8.8-1ubuntu0.13+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:20.04:LTS

    Versions
    • 2.0.5-1
    • 2.0.8-1
    • 2.0.9-1
    • 2.0.10-1
    • 2.0.10-1ubuntu1
    • 2.0.11-1ubuntu1
    • 2.0.12-1ubuntu2
    • 2.0.13-1ubuntu2
    • 2.0.13-2
    • 2.0.13-2ubuntu0.1
    • 2.0.13-2ubuntu0.2
    • 2.0.13-2ubuntu0.3
    • 2.0.13-2ubuntu0.5
    • 2.0.29-0ubuntu1
    • 2.0.29-0ubuntu1.1
    • 2.0.29-0ubuntu1.3
    • 2.0.31-0ubuntu0.1
    • 2.0.31-0ubuntu0.2
    • 2.0.31-0ubuntu0.3
    • 2.0.33-0ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:22.04:LTS

    Versions
    • 2.2.9-2ubuntu2
    • 2.4.8-1
    • 2.4.8-2ubuntu3
    • 2.4.11-1ubuntu1
    • 2.4.12-1ubuntu1
    • 2.4.12-1ubuntu2
    • 2.4.13-1ubuntu1
    • 2.4.14-1ubuntu1
    • 2.4.18-0ubuntu1
    • 2.4.18-0ubuntu1.1
    • 2.4.18-0ubuntu1.2
    • 2.4.18-0ubuntu1.3
    • 2.4.22-0ubuntu0.22.04.1
    • 2.4.22-0ubuntu0.22.04.2
    • 2.4.22-0ubuntu0.22.04.3
    • 2.4.24-0ubuntu0.22.04.1
    • 2.4.24-0ubuntu0.22.04.2
    • 2.4.24-0ubuntu0.22.04.3
    • 2.4.29-0ubuntu0.22.04.1
    • 2.4.30-0ubuntu0.22.04.1
    • 2.4.30-0ubuntu0.22.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:24.04:LTS

    Versions
    • 2.6.15-1ubuntu2
    • 2.8.5-1ubuntu1
    • 2.8.5-1ubuntu2
    • 2.8.5-1ubuntu3
    • 2.8.5-1ubuntu3.1
    • 2.8.5-1ubuntu3.2
    • 2.8.5-1ubuntu3.3
    • 2.8.5-1ubuntu3.4
    • 2.8.15-0ubuntu0.24.04.1
    • 2.8.16-0ubuntu0.24.04.1
    • 2.8.16-0ubuntu0.24.04.2
    • 2.8.16-0ubuntu0.24.04.3
    • 2.8.30-0ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:26.10

    Versions
    • 3.2.9-1ubuntu2
    • 3.2.9-1ubuntu2.1
    • 3.2.9-1ubuntu3
    • 3.4.2-1ubuntu2
    • 3.4.2-1ubuntu3
    • 3.4.2-1ubuntu4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • haproxy Ubuntu:26.04:LTS

    Versions
    • 3.0.10-1ubuntu3
    • 3.2.9-1ubuntu1
    • 3.2.9-1ubuntu2
    • 3.2.9-1ubuntu2.1
    • 3.2.9-1ubuntu2.2
    • 3.2.25-0ubuntu0.26.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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