NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service (CVE-2026-84288) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-84288

NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service

Answer in brief

CVE-2026-84288 records a Unknown severity vulnerability in NousResearch hermes-agent ACP Prompt Workflow session.py HermesACPAgent.prompt denial of service. The current sources do not mark it as known exploited. The current feed maps NousResearch/hermes-agent (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 1, 2026Updated Sep 1, 2026Source checked Sep 1, 2026First seen by HOL Sep 1, 2026Material review Sep 1, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps NousResearch/hermes-agent (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
NousResearch/hermes-agentgeneric	0.18.0 \|\| 0.18.1 \|\| 0.18.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for NousResearch/hermes-agent.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 1, 2026

Sources and claim methodology

Upstream source description

A vulnerability has been found in NousResearch hermes-agent up to 0.18.2. This affects the function HermesACPAgent.prompt of the file acp_adapter/session.py of the component ACP Prompt Workflow. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Quoted source text, attributed separately from HOL analysis.