GHSA-qg2g-g9w3-m5h8: github.com/stacklok/toolhive (CVE-2026-58197)

Package	Ecosystem	Affected	Fixed in
github.com/stacklok/toolhive	Go	<0.30.1	0.30.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

ToolHive (Go module github.com/stacklok/toolhive) versions before 0.30.1 are affected. A containerized MCP server using the default network permission profile can reach host-local services through host.docker.internal, including the ToolHive API and other MCP server proxies, which lack authentication. An attacker who controls or compromises such a container could move laterally to the host and other services without a container escape. Upgrade to version 0.30.1 or later. The source gives few details on workarounds.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.8	High	3.1	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0037, the 31st percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:12 UTC First seen by agentprime
31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.