Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-44545
StatePUBLISHED
AssignerDSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 14:16:43 UTC
Updated2026-06-15 19:53:30 UTC
Descriptiondaphne 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003280000 probability, percentile 0.243610000 (date 2026-06-20)

Problem Types: CWE-770 | CWE-770 CWE-770 (Allocation of Resources Without Limits or Throttling)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.16a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Djangoproject Daphne All All All All

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 Release Notes
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: ParkHyunWoo (en)

CNA: Carlton Gibson (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-18T03:00:00.000ZInitial report received.
CNA2026-05-06T03:00:00.000ZVulnerability confirmed.
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