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.

CVSS v3 3.7 LOW

3.7^/10

CVSS v3 : LOW

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/django/daphne/blob/main/CHANGELOG.txt	Release Notes

Configurations

Configuration 1 (hide)

cpe:2.3:a:djangoproject:daphne:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-03 14:16

Updated : 2026-07-22 19:10

NVD link : CVE-2026-44546

Mitre link : CVE-2026-44546

CVE.ORG link : CVE-2026-44546

JSON object : View

Products Affected

djangoproject

daphne

CWE

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

{"id": "CVE-2026-44546", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-44546", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-03T15:45:59.459546Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "affectedData": [{"repo": "https://github.com/django/daphne/", "vendor": "djangoproject", "product": "daphne", "versions": [{"status": "affected", "version": "4.2.0", "versionType": "python", "lessThanOrEqual": "4.2.1"}, {"status": "unaffected", "version": "4.2.2", "versionType": "python"}], "packageName": "daphne", "collectionURL": "https://pypi.org/project/daphne/", "defaultStatus": "unaffected"}]}], "published": "2026-06-03T14:16:43.720", "references": [{"url": "https://github.com/django/daphne/blob/main/CHANGELOG.txt", "tags": ["Release Notes"], "source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92", "description": [{"lang": "en", "value": "CWE-444"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "daphne anterior a la versi\u00f3n 4.2.2 reconstruye una solicitud HTTP en bruto a partir de los encabezados analizados de Twisted y la alimenta a autobahn para el procesamiento del handshake de WebSocket. Twisted no trata \\x0b, \\x0c, \\x1c, \\x1d, \\x1e, o \\x85 como separadores de l\u00ednea de encabezado, pero autobahn decodifica los valores de los encabezados a str y llama a splitlines(). Un atacante puede explotar este diferencial del analizador para inyectar encabezados adicionales en el \u00e1mbito ASGI pasado a la aplicaci\u00f3n. daphne ahora rechaza las solicitudes con estos bytes en cualquier valor de encabezado con una respuesta 400."}], "lastModified": "2026-07-22T19:10:00.120", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:djangoproject:daphne:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "48E446D3-9A77-40A0-A62A-D3F04DF924AB", "versionEndExcluding": "4.2.2"}], "operator": "OR"}]}], "sourceIdentifier": "6a34fbeb-21d4-45e7-8e0a-62b95bc12c92"}