CVE-2026-44545CWE-770

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

Medium · published June 3, 2026

CVSS v3.1
5.3
EPSS
1%
Percentile
46.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00573 · 46.6th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-06-03T13:17Z
EPSS history
Timeline
  • 03 JUN 13:17Z
    Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of service
    cvelistv5