What is CVE-2026-42434?

CVE-2026-42434 is a high-severity vulnerability in Openclaw, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-05-05.

How severe is CVE-2026-42434?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Openclaw

CVE-2026-42434

OpenClaw versions 2026.4.5 before 2026.4.10 contain a sandbox escape vulnerability allowing sandboxed agents to override exec routing by specifying host=node. Attackers can bypass sandbox boundaries and route execution to remote nodes instead of intended sandbox paths.

Vulnerability class: Broken Access Control

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.7% 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: +0.003

Affected products

Openclaw — versions 2026.4.5, 2026.4.10

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

github.com/openclaw/openclaw/security/advisories/GHSA-736r-jwj6-4w23 (vendor-advisory)
github.com/openclaw/openclaw/commit/dffad08529202edbf34e4808788e1182fe10f6a9 (patch)
www.vulncheck.com/advisories/openclaw-sandbox-escape-via-host-parameter-overrid… (third-party-advisory)

Frequently asked questions

What is CVE-2026-42434?: CVE-2026-42434 is a high-severity vulnerability in Openclaw, classified under Incorrect Authorization. CVSS score: 8.8/10. Published 2026-05-05.
How severe is CVE-2026-42434?: High severity. CVSS v3 base score is 8.8 out of 10.