High severity · published Jun 3, 2026
CVE-2026-44545
Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DA
daphne · djangoproject
4.2.0 through 4.2.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44545
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44545
Release Notes
https://github.com/django/daphne/blob/main/CHANGELOG.txt
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5.3
CVE-2026-44546
Header injection via WebSocket upgrade parser differential allows ASGI scope header spoofing