CVE-2026-82020Network attack vector

Credential store overwrite via omitted path guard

Published Aug 28, 2026 · Updated Aug 29, 2026

Improper path restriction in Hermes Agent 0.16.0 allows remote attackers to overwrite its credential store via crafted messages. The file-write tooling's sensitive-path guard omits auth.json, so an induced write replaces credential data without an approval check. Exploitation requires malicious content to reach an agent session and direct the tooling, enabling credential tampering or unauthorized access.

CVSS severity6.8
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper path restriction in Hermes Agent 0.16.0 allows remote attackers to overwrite its credential store via crafted messages. The file-write tooling's sensitive-path guard omits auth.json, so an induced write replaces credential data without an approval check. Exploitation requires malicious content to reach an agent session and direct the tooling, enabling credential tampering or unauthorized access.

The record

CVE
CVE-2026-82020
Published
Aug 28, 2026
Updated
Aug 29, 2026
Vendor
Nous Research
Product
Hermes Agent
Classifications
CWE-552, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.16.0 <0.17.0
  2. Affected versionversion=2026.6.5 <2026.6.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nous Research · Hermes Agentversion=0.16.0 <0.17.0; version=2026.6.5 <2026.6.19

Published CVSS scores

6.8VulnCheck CNACVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
7.6NVDCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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