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.
Hermes Agent 0.18.2（早于 0.19.0 的版本）存在一个供应链漏洞，源于其捆绑的 MCP 目录（catalog）中通过可变分支（mutable branch）而非固定的提交 SHA 引用第三方上游仓库。远程攻击者若控制了该上游仓库，即可向所有安装了受影响目录条目的主机传播恶意代码，无需操作员进行额外操作即可执行任意代码。
Possible ATT&CK Techniques 1 AI
T1195 · Supply Chain CompromiseAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| NousResearch | hermes-agent | 0.18.2 ~ 0.19.0 | - |
|
II. Public POCs for CVE-2026-82021
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-82021 (2)
Vendor Advisories for CVE-2026-82021 (1)
-
🔗 Page Not Found | VulnCheck third-party-advisory
Vendor Pages for CVE-2026-82021 (1)
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V. Comments for CVE-2026-82021
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