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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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-05 | Updated 2026-03-05 | Assigner VulnCheck




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

Any version before 2026.2.15
affected

Credits

Vincent Koc (@vincentkoc) reporter

References

github.com/...enclaw/security/advisories/GHSA-p536-vvpp-9mc8 (GitHub Security Advisory (GHSA-p536-vvpp-9mc8)) vendor-advisory

github.com/...ommit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147 (Patch Commit) patch

www.vulncheck.com/...nded-response-parsing-in-web-fetch-tool (VulnCheck Advisory: OpenClaw < 2026.2.15 - Denial of Service via Unbounded Response Parsing in web_fetch Tool) third-party-advisory

cve.org (CVE-2026-28394)

nvd.nist.gov (CVE-2026-28394)

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