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CVE-2026-44546

CVE-2026-44546 · Header injection via WebSocket upgrade parser differential allows ASGI scope header spoofing

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

daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.

CVSS 3.7 · Low · EPSS 0.2% · 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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