Resource exhaustion in Djangoproject Daphne
CVE-2026-44545
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.006 (45.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.002
Affected products
- Djangoproject Daphne — versions 4.2.0, 4.2.2
Weakness classification (CWE)
References
- 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (release-notes, Release Notes)
Frequently asked questions
- What is CVE-2026-44545?
- CVE-2026-44545 is a medium-severity vulnerability in Djangoproject Daphne, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-06-03.
- How severe is CVE-2026-44545?
- Medium severity. CVSS v3 base score is 5.3 out of 10.