# CVE-2026-85105: NousResearch hermes-agent authorization bypass in Session Management

Source: https://junglewise.ai/threats/cve-2026-85105-nousresearch-hermes-agent-authorization-bypass-in-session  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-03. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-85105 · Severity: high · CVSS 7.3 · Published 2026-09-03

NousResearch hermes-agent is a software component used for managing agent sessions. A flaw in its session management allows attackers to bypass authorization checks by manipulating the session_id parameter, potentially granting unauthorized access to protected functionality. This vulnerability can be exploited remotely without authentication.

Technologies: [NousResearch Hermes Agent](https://junglewise.ai/threats/technologies/hermes-agent). Vendors: [NousResearch](https://junglewise.ai/threats/vendors/nousresearch).

## Quick answers

**Is CVE-2026-85105 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85105 being exploited in the wild.

**How severe is CVE-2026-85105?** High severity, with a CVSS score of 7.3, published 3 September 2026.

**Which products and versions are affected?** NousResearch Hermes Agent 0.18.0.

**Is there a fix for CVE-2026-85105?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-85105 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-85105?** Check whether you run NousResearch Hermes Agent at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authorization bypass (CWE-307/CWE-863) in the _sess_nowait function within s71.py of hermes-agent's Session Management component. The flaw allows attackers to manipulate the session_id argument to circumvent authorization controls. The attack vector is network-based and requires no prior authentication. An attacker can remotely exploit this to gain unauthorized access to session-protected resources or operations. No patch information is currently available as the vendor did not respond to early disclosure attempts.

## Affected products

- NousResearch hermes-agent 0.18.0

## Timeline

- 2026-09-03: disclosed

## References

- [https://vuldb.com/cve/CVE-2026-85105](https://vuldb.com/cve/CVE-2026-85105)
- [https://vuldb.com/submit/885131](https://vuldb.com/submit/885131)

## Related threats

- [NousResearch hermes-agent resource exhaustion in resourceBufferFromUrl](https://junglewise.ai/threats/cve-2026-85107-nousresearch-hermes-agent-resource-exhaustion-in)
- [NousResearch hermes-agent server-side request forgery in Link Title Fetch](https://junglewise.ai/threats/cve-2026-85106-nousresearch-hermes-agent-server-side-request-forgery-in-link)
- [NousResearch hermes-agent denial of service in MCP Tool](https://junglewise.ai/threats/cve-2026-84289-nousresearch-hermes-agent-denial-of-service-in-mcp-tool)
- [NousResearch hermes-agent denial of service in ACP Prompt Workflow](https://junglewise.ai/threats/cve-2026-84288-nousresearch-hermes-agent-denial-of-service-in-acp-prompt)
- [NousResearch hermes-agent denial of service in session chat](https://junglewise.ai/threats/cve-2026-84287-nousresearch-hermes-agent-denial-of-service-in-session-chat)