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TI-2026-38866 Aliases CVE-2026-53870GHSA-99f9-j8r3-p853

Hermes Agent < 0.16.0 - Sensitive File Permission Vulnerability in Store Files

Priority MEDIUM 63CWE-276Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Hermes Agent before 0.16.0 creates response_store.db and webhook_subscriptions.json with world-readable permissions (mode 0o644), exposing conversation history and HMAC secrets to local users. Attackers with local filesystem access can read these files directly to obtain sensitive data including conversation history, tool payloads, prompts, and per-route HMAC secrets.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0016 5th percentileScored 2026-11-07
Fix Fixed hermes-agent (NousResearch): 0.16.0hermes-agent (PyPI): 0.16.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NousResearchhermes-agentbefore 0.16.00.16.0Patch availableCNA
—hermes-agent (PyPI)before 0.16.00.16.0Patch availableGHSA-99f9-j8r3-p853
  • hermes-agent VendorNousResearch Affected before 0.16.0 Fixed in 0.16.0 Patch available CNA
  • hermes-agent (PyPI) Vendor— Affected before 0.16.0 Fixed in 0.16.0 Patch available GHSA-99f9-j8r3-p853

Remediation

  • Fix · CNA hermes-agent (NousResearch) Fixed in 0.16.0
  • Fix · GHSA-99f9-j8r3-p853 hermes-agent (PyPI) Fixed in 0.16.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    NousResearch hermes-agent 0.16.0

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-38865 Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket EndpointsPriority MEDIUM 44
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53870
  2. 2026-10-03 Alias added: GHSA-99f9-j8r3-p853

References

Patch 3

Advisory 1

Other 2

  • TI-2026-50258 Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection CVSS 4.0HIGH 8.6
  • TI-2026-12325 NousResearch hermes-agent Live Webhook Endpoint base.py extract_media path traversal CVSS 4.0MEDIUM 6.9
  • TI-2026-08962 NousResearch hermes-agent Webhook Endpoint feishu.py _handle_webhook_request resource consumption CVSS 4.0MEDIUM 6.9
  • TI-2026-08959 NousResearch hermes-agent run_agent.py _compress_context injection CVSS 4.0MEDIUM 6.9
  • TI-2026-08958 NousResearch hermes-agent skills_tool.py skill_view injection CVSS 4.0MEDIUM 6.9
  • TI-2026-08218 NousResearch hermes-agent Environment Variable code_execution_tool.py execute_code sandbox CVSS 4.0MEDIUM 6.9
See all 44 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences