OpenClaw has a IPv6 multicast SSRF classifier bypass
Summary
OpenClaw's SSRF IP classifier did not treat IPv6 multicast literals (ff00::/8) as blocked/private-internal. This allowed literal multicast hosts to pass SSRF preflight checks.
Impact
A bypass in address classification existed for IPv6 multicast literals. OpenClaw's network fetch/navigation paths are constrained to HTTP/HTTPS and this was triaged as low-severity defense-in-depth hardening.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected versions:
<= 2026.2.24 - Patched versions:
>= 2026.2.25
Technical Details
The IPv6 private/internal range set omitted multicast, so addresses like ff02::1 and ff05::1:3 were not classified as blocked by the shared SSRF classifier.
Fix Commit(s)
baf656bc6fd7f83b6033e6dbc2548ec75028641f
Release Process Note
patched_versions is pre-set to the planned next npm release (2026.2.25). Once that release is published on npm, the advisory is published.
OpenClaw thanks @zpbrent for reporting.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | openclaw | < 2026.2.25 | 2026.2.25 |
References
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N- Weakness (CWE)
CWE-918- Platform
- npm
- Package
openclaw- Disclosed
- 03.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-h97f-6pqj-q452 - CC BY 4.0
Vulnerability history: openclaw
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 589
- First → latest
- 02.2026 10.2026
- Without a fix
- 9
- Exploited in attacks
- 0
Severity breakdown
- Critical 20
- High 215
- Medium 300
- Low 54
Disclosures per year
- 2026: 589
-
OpenClaw has a IPv6 multicast SSRF classifier bypass this entry
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