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CVE-2026-82021— Hermes Agent 0.18.2 < 0.19.0 MCP Catalog Supply Chain RCE via Mutable Branch Reference

Quick assessment

Affected
NousResearch hermes-agent
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nous Research Hermes Agent是Nous Research团队开源的一款具备自我学习循环的AI代理工具。 NousResearch Hermes Agent 0.19.0之前版本存在软件供应链问题漏洞，该漏洞源于捆绑的MCP目录通过可变分支而非固定提交SHA引用第三方上游仓库，可能导致远程攻击者通过破坏上游仓库执行任意代码，并将恶意代码传播至每个安装受影响目录条目的主机。

CVSS 8.3 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1195 · Supply Chain Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
NousResearch hermes-agent 0.18.2< 0.19.0 affected
2026.7.7.2< 2026.7.20 affected
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I. Basic Information for CVE-2026-82021

Vulnerability Information
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Vulnerability Title
Hermes Agent 0.18.2 < 0.19.0 MCP Catalog Supply Chain RCE via Mutable Branch Reference
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
下载代码缺少完整性检查
Source: CVE Program / CVE List V5
Vulnerability Title
NousResearch Hermes Agent 软件供应链问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nous Research Hermes Agent是Nous Research团队开源的一款具备自我学习循环的AI代理工具。 NousResearch Hermes Agent 0.19.0之前版本存在软件供应链问题漏洞，该漏洞源于捆绑的MCP目录通过可变分支而非固定提交SHA引用第三方上游仓库，可能导致远程攻击者通过破坏上游仓库执行任意代码，并将恶意代码传播至每个安装受影响目录条目的主机。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NousResearch hermes-agent 0.18.2 ~ 0.19.0 -

II. Public POCs for CVE-2026-82021

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III. Intelligence Information for CVE-2026-82021

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Patches & Fixes for CVE-2026-82021 (2)

Vendor Advisories for CVE-2026-82021 (1)

Vendor Pages for CVE-2026-82021 (1)

IV. Related Vulnerabilities

Same product: hermes-agent
Same vendor: NousResearch
Same weakness: CWE-494

V. Comments for CVE-2026-82021

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