CVE-2026-82021High· 8.3▾ Twilight

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 branc…

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score46/ 100 · Moderate

impact 45.7 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

Aug 28, 2026

Updated

Sep 8, 2026

CVSS

8.3

Vendor

—

Product

—

CWE

CWE-494

Depth score

46 · Moderate

EPSS

0.34% · p27

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS history

Exploit-prediction probability, daily snapshots since Sep 8.

0.2% → 0.3%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 28 days

Aug 28, 2026Published
Disclosed via NVD
Sep 8, 2026Record revised
Last analysed / modified upstream
Sep 8, 2026EPSS first tracked
0.2%
Sep 25, 2026EPSS peak
0.2% → 0.3%

CWE-494 #nvd

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd

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