CVE-2026-85105Network attack vectorHinoki check available

Unauthenticated session access via user-controlled session identifiers

Published Sep 3, 2026 · Updated Sep 3, 2026

Authorization bypass in Nous Research Hermes Agent 0.18.0 allows remote attackers to cross session boundaries via a session identifier. The _sess_nowait function in s71.py uses an attacker-controlled session_id to select a session without enforcing authorization. No credentials or user interaction are required, but public sources do not identify the exact session data or operations exposed.

CVSS severity6.9
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Nous Research Hermes Agent 0.18.0 allows remote attackers to cross session boundaries via a session identifier. The _sess_nowait function in s71.py uses an attacker-controlled session_id to select a session without enforcing authorization. No credentials or user interaction are required, but public sources do not identify the exact session data or operations exposed.

The record

CVE
CVE-2026-85105
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
Nous Research
Product
Hermes Agent
Classifications
CWE-639
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=0.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nous Research · Hermes Agentversion=0.18.0

Published CVSS scores

6.9VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
7.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
7.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key

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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