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Advisories

Hermes Agent 0.18.2 < 0.19.0 MCP Catalog Supply Chain RCE via Mutable Branch Reference

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severity
critical
date
Affecting

  • hermes-agent >= 0.18.2, < 0.19.0

  • hermes-agent >= 2026.7.7.2, < 2026.7.20

CWE
  • CWE-494 Download of Code Without Integrity Check
CVSS
9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Zubair Ashraf (@zashraf1337), Helmet Security
Description
Hermes Agent 0.18.2 prior to 0.19.0 contains a supply chain vulnerability in its bundled MCP catalog that allows a remote attacker to execute arbitrary code by compromising a third-party upstream repository referenced via a mutable branch rather than a pinned commit SHA. An attacker who compromises the upstream repository can propagate malicious code to every host that installs the affected catalog entry, with no further action required by the operator.

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