# CVE-2026-16196: Sipeed PicoClaw SSRF in web_fetch via special-use IPv4 bypass

Source: https://junglewise.ai/threats/cve-2026-16196-sipeed-picoclaw-ssrf-in-web-fetch-via-special-use-ipv4-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-18. Updated: 2026-07-18  
License: CC BY 4.0 with a link back

CVE-2026-16196 · Severity: medium · CVSS 6.3 · Published 2026-07-18

Sipeed PicoClaw is an AI assistant framework designed for high efficiency on low-power hardware. A security flaw in its web-fetching component allows an attacker to bypass safety restrictions and force the server to make unauthorized requests to internal network addresses. This could lead to the exposure of sensitive internal data or unauthorized access to private services that are not intended to be reachable from the internet.

Technologies: [Sipeed PicoClaw](https://junglewise.ai/threats/technologies/picoclaw). Vendors: [Sipeed](https://junglewise.ai/threats/vendors/sipeed).

## Quick answers

**Is CVE-2026-16196 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-16196 being exploited in the wild.

**How severe is CVE-2026-16196?** Medium severity, with a CVSS score of 6.3, published 18 July 2026.

**Which products and versions are affected?** Sipeed PicoClaw up to 0.2.9.

**Is there a fix for CVE-2026-16196?** A patch was published on 2026-07-18: Patch 2efbe5d560e7ed9bc5209c203dc4aa6ecdbc7405 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-16196 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-16196?** Check whether you run Sipeed PicoClaw at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in the `web_fetch` component of Sipeed PicoClaw up to version 0.2.9. The root cause is an incomplete IP address classifier in the `isPrivateOrRestrictedIP` function within `pkg/tools/integration/web.go`. While the function attempts to block RFC 1918, loopback, and CGNAT ranges, it fails to include the special-use IPv4 benchmark range `198.18.0.0/15`. A remote attacker with the ability to provide input to the `web_fetch` tool can exploit this omission to reach internal network destinations. A patch has been released in commit `2efbe5d560e7ed9bc5209c203dc4aa6ecdbc7405` which adds the missing range to the blocklist.

## Affected products

- Sipeed PicoClaw up to 0.2.9

## Timeline

- 2026-07-18: disclosed
- 2026-07-18: advisory
- 2026-07-18: patched: Patch 2efbe5d560e7ed9bc5209c203dc4aa6ecdbc7405

## References

- [https://github.com/sipeed/picoclaw/](https://github.com/sipeed/picoclaw/)
- [https://github.com/sipeed/picoclaw/commit/2efbe5d560e7ed9bc5209c203dc4aa6ecdbc7405](https://github.com/sipeed/picoclaw/commit/2efbe5d560e7ed9bc5209c203dc4aa6ecdbc7405)
- [https://github.com/sipeed/picoclaw/issues/3077](https://github.com/sipeed/picoclaw/issues/3077)
- [https://github.com/sipeed/picoclaw/pull/3085](https://github.com/sipeed/picoclaw/pull/3085)
- [https://vuldb.com/cve/CVE-2026-16196](https://vuldb.com/cve/CVE-2026-16196)
- [https://vuldb.com/submit/852963](https://vuldb.com/submit/852963)
- [https://vuldb.com/vuln/380012](https://vuldb.com/vuln/380012)

## Related threats

- [Sipeed PicoClaw authentication bypass in First Run Setup](https://junglewise.ai/threats/cve-2026-16198-sipeed-picoclaw-authentication-bypass-in-first-run-setup)
- [Sipeed PicoClaw missing authorization in Feishu Group Message Handler](https://junglewise.ai/threats/cve-2026-16197-sipeed-picoclaw-missing-authorization-in-feishu-group-message)
- [Sipeed PicoClaw incorrect authorization in WeCom Group Message Handler](https://junglewise.ai/threats/cve-2026-16195-sipeed-picoclaw-incorrect-authorization-in-wecom-group-message)
- [Sipeed PicoClaw untrusted functionality inclusion in NewContextBuilder](https://junglewise.ai/threats/cve-2026-16085-sipeed-picoclaw-untrusted-functionality-inclusion-in)
- [Sipeed PicoClaw SSRF bypass in web_fetch via ISATAP literals](https://junglewise.ai/threats/cve-2026-16084-sipeed-picoclaw-ssrf-bypass-in-web-fetch-via-isatap-literals)