Is CVE-2026-14626 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-14626 being exploited in the wild.

How severe is CVE-2026-14626?

Medium severity, with a CVSS score of 4.3, published 4 July 2026.

Which products and versions are affected?

NousResearch Hermes Agent up to 2026.4.30.

Is there a fix for CVE-2026-14626?

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-2026-14626 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-14626?

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.

CVE-2026-14626: NousResearch hermes-agent denial of service in AIAgent.run_conversation

CVE-2026-14626 · Severity: medium · CVSS 4.3 · Published 2026-07-04

NousResearch hermes-agent is an AI agent framework that manages conversations and tasks. A vulnerability in its HTTP API allows an attacker to send specially crafted conversation histories that include fake task lists. This can overwhelm the system's memory or processing capacity for that session, leading to a denial of service where the AI agent becomes unresponsive or fails to process further requests.

Technologies: NousResearch Hermes Agent. Vendors: NousResearch.

Quick answers

Is CVE-2026-14626 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-14626 being exploited in the wild.
How severe is CVE-2026-14626?: Medium severity, with a CVSS score of 4.3, published 4 July 2026.
Which products and versions are affected?: NousResearch Hermes Agent up to 2026.4.30.
Is there a fix for CVE-2026-14626?: 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-2026-14626 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-14626?: 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 (DoS) vulnerability exists in NousResearch hermes-agent up to version 2026.4.30 within the AIAgent.run_conversation function of run_agent.py. The vulnerability stems from the HTTP API server's failure to verify the authenticity or size of 'conversation_history' entries provided in API requests. Specifically, the _hydrate_todo_store function trusts any role='tool' message containing a 'todos' JSON object as authoritative output. An attacker with network access and basic API privileges can submit forged, oversized todo entries that are stored in TodoStore and subsequently re-injected into the model's context window. This leads to context exhaustion and session-specific denial of service. As of the advisory date, no patch is available.

Affected products

NousResearch hermes-agent up to 2026.4.30

Timeline

2026-06-01: disclosed: Initial researcher gist published
2026-07-04: advisory: CVE published to NVD

References

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