What is CVE-2026-42437?

CVE-2026-42437 is a high-severity vulnerability in Openclaw, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-05.

How severe is CVE-2026-42437?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Openclaw

CVE-2026-42437

OpenClaw versions 2026.4.9 before 2026.4.10 contain a denial of service vulnerability in the voice-call realtime WebSocket path that accepts oversized frames without proper validation. Remote attackers can send oversized WebSocket frames to cause service unavailability for deployments exposing the voice-call realtime WebSocket path.

Published 2026-05-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (53.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003

Affected products

Openclaw — versions 2026.4.9, 2026.4.10

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/openclaw/openclaw/security/advisories/GHSA-vw3h-q6xq-jjm5 (vendor-advisory)
github.com/openclaw/openclaw/commit/afadb7dae6738819ad9c7d2597ace0516957d20e (patch)
www.vulncheck.com/advisories/openclaw-denial-of-service-via-oversized-websocket… (third-party-advisory)

Frequently asked questions

What is CVE-2026-42437?: CVE-2026-42437 is a high-severity vulnerability in Openclaw, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-05-05.
How severe is CVE-2026-42437?: High severity. CVSS v3 base score is 7.5 out of 10.