CVE-2026-28394 json
OpenClaw < 2026.2.15 - Denial of Service via Unbounded Response Parsing in web_fetch Tool
published 2026-02-19 8 mo ago modified 2026-06-17 4 mo ago also GHSA-p536-vvpp-9mc8 , EUVD-2026-9894
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm openclaw 2026.2.15
- OpenClaw OpenClaw 2026.2.15
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | openclaw | <2026.2.15 |
2026.2.15 |
Affected products
- OpenClaw OpenClaw
Classification
References
-
github.com
/openclaw/openclaw/commit/166cf6a3e04c7df42bea70a7ad5ce2b9df46d147
patch, web
-
github.com
/openclaw/openclaw/security/advisories/GHSA-p536-vvpp-9mc8
vendor-advisory, web
-
vulncheck.com
/advisories/openclaw-denial-of-service-via-unbounded-response-parsing-in-web-fetch-tool
third-party-advisory
-
github.com
/openclaw/openclaw
package
-
github.com
/openclaw/openclaw/releases/tag/v2026.2.15
web
Sources
- CVE List CVE-2026-28394
- GitHub Advisory GHSA-p536-vvpp-9mc8
- NVD CVE-2026-28394
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