What’s Vulnerable › Vulnerabilities

CVE-2026-28394: OpenClaw < 2026.2.15 - Denial of Service via Unbounded Response Parsing in web_fetch Tool

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-05 · updated 2026-06-17
• Weakness: CWE-770

Description

OpenClaw versions prior to 2026.2.15 contain a denial of service vulnerability in the web_fetch tool that allows attackers to crash the Gateway process through memory exhaustion by parsing oversized or deeply nested HTML responses. Remote attackers can social-engineer users into fetching malicious URLs with pathological HTML structures to exhaust server memory and cause service unavailability.

Affected products

• OpenClaw: before 2026.2.15 — fixed in 2026.2.15

How to fix

Upgrade to a fixed version: OpenClaw 2026.2.15. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/commit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147
• https://github.com/openclaw/openclaw/security/advisories/GHSA-p536-vvpp-9mc8
• https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-response-parsing-in-web-fetch-tool

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