Resource exhaustion in OpenClaw - CVE-2026-29609
Published: May 4, 2026
Vulnerability identifier: #VU129459
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-29609
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenClaw
Affected software:
OpenClaw
OpenClaw
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in fetchWithGuard in src/media/input-files.ts when fetching URL-backed media responses with missing or incorrect content-length values. A remote attacker can serve a specially crafted oversized response to cause a denial of service.
The issue occurs because the full response body is buffered in memory via arrayBuffer() before maxBytes is enforced.
How to mitigate CVE-2026-29609
Install security update from vendor's website.