CVE-2026-44545

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

Published Jun 3, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Description
daphne 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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-rrc9-mx66-ffcm daphne: Unauthenticated attackers can cause excessive memory consumption by sending arbitrarily large WebSocket messages/frames
History
Type Values Removed Values Added
CPEs cpe:2.3:a:djangoproject:daphne:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Djangoproject
Djangoproject daphne
Vendors & Products Djangoproject
Djangoproject daphne
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description daphne 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.
Title Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
DSF
Published
Updated
Jun 3, 2026, 3:48 PM
Reserved
May 6, 2026, 8:29 PM
Status
Analyzed
Published
Jun 3, 2026, 2:16 PM
Modified
Jul 22, 2026, 7:10 PM