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    CVE-2026-84288

    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.

    Published:Sep 1, 2026
    Last Modified:Sep 2, 2026
    EPS:Sep 1, 2026
    EPSS Score:0.00271
    CVSS Score:4.3

    Affected Products

    Vendor
    Nousresearch
    Product
    Hermes-agent

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-85105 (CVSS 6.9) — A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is the function _sess_nowait…
    CVE-2026-84289 (CVSS 2.1) — A vulnerability was found in NousResearch hermes-agent up to 0.18.2. This vulnerability affects the function l…
    CVE-2026-84287 (CVSS 2.1) — A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is some unknown functionalit…
    CVE-2026-82021 (CVSS 9) — Hermes Agent 0.18.2 prior to 0.19.0 contains a supply chain vulnerability in its bundled MCP catalog that allo…
    CVE-2026-82020 (CVSS 7.6) — Hermes Agent 0.16.0 prior to 0.17.0 contains an improper path restriction vulnerability that allows attackers …
    CVE-2026-18993 (CVSS 2.1) — A vulnerability was detected in NousResearch hermes-agent up to 0.16.0. Affected by this issue is some unknown…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High