Header injection via WebSocket upgrade parser differential allows ASGI scope header spoofing

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Summary

CVECVE-2026-44546
StatePUBLISHED
AssignerDSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 14:16:43 UTC
Updated2026-06-04 15:21:14 UTC
Descriptiondaphne 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.

Risk And Classification

Primary CVSS: v3.1 3.7 LOW from 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.000360000 probability, percentile 0.110420000 (date 2026-06-09)

Problem Types: CWE-444 | CWE-444 CWE-444 (Inconsistent Interpretation of HTTP Requests -- "HTTP Request/Response Smuggling")

VersionSourceTypeScoreSeverityVector
3.16a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS3.7LOWCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Djangoproject Daphne affected 4.2.0 4.2.1 python Not specified
CNA Djangoproject Daphne unaffected 4.2.2 python Not specified

References

ReferenceSourceLinkTags
github.com/django/daphne/blob/main/CHANGELOG.txt 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Rene Henningsen (en)

CNA: Carlton Gibson (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-09T03:00:00.000ZInitial report received.
CNA2026-05-06T03:00:00.000ZVulnerability confirmed.
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