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vulnerabilityhigh · CVSS 8.1patched

CVE-2026-23912

MCP protocol — tool description spoofing across implementations

Timeline
Disclosed2026-04-03Patch available2026-04-08Patched2026-05-03

Each rust dot is a disclosed event in this advisory's life: when it was published, when (if ever) a patch shipped and where things stand today (the dashed line). Ghosted dots are events that haven't happened yet.

Summary

A flaw in the way several MCP server implementations handled tool description updates allowed a malicious MCP server to silently rename a tool after handshake. Agents that cached the original tool name could be tricked into invoking a different tool. Affected the MCP server libraries used by both OpenClaw and Hermes Agent.

Details

CVE IDCVE-2026-23912
Severityhigh (8.1)
CVSS vectorAV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Published2026-04-03
Patched2026-04-08
Affected versionsMultiple
Fixed inOpenClaw 2026.4.5, Hermes 2026.4.3, mcp-server-go 0.7.4
Exploited in the wildno known exploitation

Affected AI agents

OpenClaw →Hermes Agent →
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What to do

  • If you run an affected version: upgrade to OpenClaw 2026.4.5, Hermes 2026.4.3, mcp-server-go 0.7.4 immediately. Do not delay this for convenience reasons.
  • Rotate any credentials that may have been exposed via the affected component.
  • Audit your logs for indicators of exploitation — unexpected outbound traffic, anomalous tool calls, unfamiliar authenticated sessions.
  • If exploitation is confirmed, treat the host as compromised: rebuild from a clean image, rotate every secret on the host, audit lateral movement.

Sources

Are you affected?

Type the version you have installed. We check it against Multiple.

This is a best-effort check. When in doubt, upgrade to OpenClaw 2026.4.5, Hermes 2026.4.3, mcp-server-go 0.7.4.

Related AI CVEs

See also: all AI CVEs, AI agents tracker, scan your AI stack, Pro alerts, methodology.