Quick answers
- Is CVE-2026-84288 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84288 being exploited in the wild.
- How severe is CVE-2026-84288?
- Medium severity, with a CVSS score of 4.3, published 1 September 2026.
- Which products and versions are affected?
- NousResearch Hermes Agent up to 0.18.2.
- Is there a fix for CVE-2026-84288?
- 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-2026-84288 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-84288?
- 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
A denial-of-service vulnerability exists in the HermesACPAgent.prompt function within acp_adapter/session.py of the ACP Prompt Workflow component. The vulnerability allows remote attackers to trigger a denial-of-service condition through improper handling of queued prompts. No authentication is required, and the attack is network-accessible. The vulnerability has been publicly disclosed with proof-of-concept code available, though the vendor did not respond to early notification attempts. Patches or vendor updates have not been confirmed.
Affected products
- NousResearch hermes-agent up to 0.18.2
Timeline
- 2026-09-01: disclosed: Public disclosure with proof-of-concept code