VULNERABILITY INTELLIGENCE
CVE-2026-82021
CVSS score8.3 HIGH
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-08-28
Last modified2026-09-08
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
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.
Weakness classification
- disclosure@vulncheck.com: CWE-494