Medium severity · published Mar 5, 2026
CVE-2026-28394
OpenClaw < 2026.2.15 - Denial of Service via Unbounded Response Parsing in web_fetch Tool
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenClaw · OpenClaw
before 2026.2.15 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28394
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28394
Patch
https://github.com/openclaw/openclaw/commit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147
Vendor Advisory
https://github.com/openclaw/openclaw/security/advisories/GHSA-p536-vvpp-9mc8
Third Party Advisory
https://www.vulncheck.com/advisories/openclaw-denial-of-service-via-unbounded-response-parsing-in-web-fetch-tool
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