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CVE-2026-44545

CVE-2026-44545 · Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service

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

daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.

CVSS 5.3 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • daphne

    Versions
    • ≥ 4.2.0, ≤ 4.2.1: Affected (python)
    • 4.2.2: Not affected (python)

    Update to 4.2.2

  • python-daphne Debian:12

    Versions
    • 4.0.0-1
    • 4.1.2-1
    • 4.1.2-2
    • 4.2.1-1
    • 4.2.1-2
    • 4.2.2-0.1
    • 4.2.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Debian:13

    Versions
    • 4.1.2-2
    Affected ranges
    • ECOSYSTEM: < 4.1.2-2+deb13u1

    Update to 4.1.2-2+deb13u1

  • python-daphne Debian:14

    Versions
    • 4.1.2-2
    • 4.2.1-1
    • 4.2.1-2
    Affected ranges
    • ECOSYSTEM: < 4.2.2-0.1

    Update to 4.2.2-0.1

  • daphne PyPI

    Versions
    • 0.10.0
    • 0.10.1
    • 0.10.2
    • 0.10.3
    • 0.11.0
    • 0.11.1
    • 0.11.2
    • 0.11.3
    • 0.12.0
    • 0.12.1
    • 0.12.2
    • 0.13.0
    • 0.13.1
    • 0.14.0
    • 0.14.1
    • 0.14.2
    • 0.14.3
    • 0.15.0
    • 0.8.1
    • 0.8.2
    • 0.9
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 1.0.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.1.0
    • 1.2.0
    • 1.3.0
    • 1.4.0
    • 1.4.1
    • 1.4.2
    • 2.0.0
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.1.0
    • 2.1.1
    • 2.1.2
    • 2.2.0
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.2.4
    • 2.2.5
    • 2.3.0
    • 2.4.0
    • 2.4.1
    • 2.5.0
    • 3.0.0
    • 3.0.1
    • 3.0.2
    • 4.0.0
    • 4.0.0b1
    • 4.1.0
    • 4.1.1
    • 4.1.2
    • 4.2.0
    • 4.2.1
    Affected ranges
    • ECOSYSTEM: < 4.2.2

    Update to 4.2.2

  • python-daphne Ubuntu:18.04:LTS

    Versions
    • 1.4.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:20.04:LTS

    Versions
    • 2.3.0-1
    • 2.4.0-1
    • 2.4.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:22.04:LTS

    Versions
    • 3.0.1-1
    • 3.0.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:24.04:LTS

    Versions
    • 4.0.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:25.10

    Versions
    • 4.1.2-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:26.10

    Versions
    • 4.2.1-2
    • 4.2.2-0.1
    • 4.2.3-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-daphne Ubuntu:26.04:LTS

    Versions
    • 4.1.2-2
    • 4.2.1-1
    • 4.2.1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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