Vulnerability Details CVE-2026-44546
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 6.9%
CVSS Severity
CVSS v3 Score 3.7
Products affected by CVE-2026-44546
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cpe:2.3:a:djangoproject:daphne:0.10.0
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cpe:2.3:a:djangoproject:daphne:0.10.1
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cpe:2.3:a:djangoproject:daphne:0.10.2
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cpe:2.3:a:djangoproject:daphne:0.10.3
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cpe:2.3:a:djangoproject:daphne:0.11.0
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cpe:2.3:a:djangoproject:daphne:0.11.1
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cpe:2.3:a:djangoproject:daphne:0.11.2
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cpe:2.3:a:djangoproject:daphne:0.11.3
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cpe:2.3:a:djangoproject:daphne:0.11.4
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cpe:2.3:a:djangoproject:daphne:0.12.0
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cpe:2.3:a:djangoproject:daphne:0.12.1
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cpe:2.3:a:djangoproject:daphne:0.12.2
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cpe:2.3:a:djangoproject:daphne:0.13.0
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cpe:2.3:a:djangoproject:daphne:0.13.1
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cpe:2.3:a:djangoproject:daphne:0.14.0
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cpe:2.3:a:djangoproject:daphne:0.14.1
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cpe:2.3:a:djangoproject:daphne:0.14.2
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cpe:2.3:a:djangoproject:daphne:0.14.3
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cpe:2.3:a:djangoproject:daphne:0.15.0
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cpe:2.3:a:djangoproject:daphne:0.8
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cpe:2.3:a:djangoproject:daphne:0.8.1
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cpe:2.3:a:djangoproject:daphne:0.8.2
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cpe:2.3:a:djangoproject:daphne:0.9
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cpe:2.3:a:djangoproject:daphne:0.9.3
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cpe:2.3:a:djangoproject:daphne:1.0.0
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cpe:2.3:a:djangoproject:daphne:1.0.1
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cpe:2.3:a:djangoproject:daphne:1.0.2
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cpe:2.3:a:djangoproject:daphne:1.0.3
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cpe:2.3:a:djangoproject:daphne:1.1.0
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cpe:2.3:a:djangoproject:daphne:1.2.0
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cpe:2.3:a:djangoproject:daphne:1.3.0
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cpe:2.3:a:djangoproject:daphne:1.4.0
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cpe:2.3:a:djangoproject:daphne:1.4.1
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cpe:2.3:a:djangoproject:daphne:1.4.2
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cpe:2.3:a:djangoproject:daphne:2.0.0
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cpe:2.3:a:djangoproject:daphne:2.0.1
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cpe:2.3:a:djangoproject:daphne:2.0.2
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cpe:2.3:a:djangoproject:daphne:2.0.3
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cpe:2.3:a:djangoproject:daphne:2.0.4
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cpe:2.3:a:djangoproject:daphne:2.1.0
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cpe:2.3:a:djangoproject:daphne:2.1.1
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cpe:2.3:a:djangoproject:daphne:2.1.2
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cpe:2.3:a:djangoproject:daphne:2.2.0
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cpe:2.3:a:djangoproject:daphne:2.2.1
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cpe:2.3:a:djangoproject:daphne:2.2.2
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cpe:2.3:a:djangoproject:daphne:2.2.3
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cpe:2.3:a:djangoproject:daphne:2.2.4
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cpe:2.3:a:djangoproject:daphne:2.2.5
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cpe:2.3:a:djangoproject:daphne:2.3.0
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cpe:2.3:a:djangoproject:daphne:2.4.0
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cpe:2.3:a:djangoproject:daphne:2.4.1
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cpe:2.3:a:djangoproject:daphne:2.5.0
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cpe:2.3:a:djangoproject:daphne:3.0.0
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cpe:2.3:a:djangoproject:daphne:3.0.1
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cpe:2.3:a:djangoproject:daphne:3.0.2
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cpe:2.3:a:djangoproject:daphne:4.0.0
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cpe:2.3:a:djangoproject:daphne:4.1.0
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cpe:2.3:a:djangoproject:daphne:4.1.1
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cpe:2.3:a:djangoproject:daphne:4.1.2
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cpe:2.3:a:djangoproject:daphne:4.2.0
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cpe:2.3:a:djangoproject:daphne:4.2.1