NousResearch Hermes-agent vulnerabilities

CVE-2026-71963 High · 8.8 CWE-78 Sep 3, 2026

Hermes Agent 0.18.2 - 0.21.0 RCE via git core.fsmonitor Config Injection

Hermes Agent 0.18.2 through 0.21.0, fixed in commit f6234d0, contains a remote code execution vulnerability that allows attackers to execute arbitrary OS commands by supplying a malicious repository with a crafted .git/config that sets core.fsmonitor to an attacker-controlled command. When a user opens the malicious repository and sends any message, the agent triggers a git status index refresh which executes the injected command in the user's process context, exposing the full environment including configured provider API keys.

CVE-2026-85107 Medium · 4.3 CWE-400 Sep 3, 2026

NousResearch hermes-agent Electron Main Process main.ts resourceBufferFromUrl allocation of resources

A vulnerability was found in NousResearch hermes-agent 0.18.0. This vulnerability affects the function resourceBufferFromUrl of the file apps/desktop/electron/main.ts of the component Electron Main Process. Performing a manipulation results in allocation of resources. The attack may be initiated remotely. copyImageFromUrl() entry point no longer reachable on current main. That function did exist at v2026.8.3 but was removed by v2026.8.19. The modern copy-image path is Electron-native event.sender.copyImageAt().

CVE-2026-85106 Medium · 6.3 CWE-918 Sep 3, 2026

NousResearch hermes-agent Link Title Fetch index.tsx fetchLinkTitle server-side request forgery

A vulnerability has been found in NousResearch hermes-agent 0.18.0. This affects the function fetchLinkTitle of the file apps/desktop/src/app/artifacts/index.tsx of the component Link Title Fetch. Such manipulation of the argument url leads to server-side request forgery. The attack can be launched remotely. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-85105 High · 7.3 CWE-285 Sep 3, 2026

NousResearch hermes-agent Session Management s71.py _sess_nowait authorization

A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is the function _sess_nowait of the file s71.py of the component Session Management. This manipulation of the argument session_id causes authorization bypass. The attack can be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-84289 Medium · 4.3 CWE-400 Sep 1, 2026

NousResearch hermes-agent MCP Tool mcp_tool.py list_tools memory allocation

A vulnerability was found in NousResearch hermes-agent up to 0.18.2. This vulnerability affects the function list_tools of the file tools/mcp_tool.py of the component MCP Tool. Performing a manipulation results in uncontrolled memory allocation. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-84288 Medium · 4.3 CWE-404 Sep 1, 2026

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

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.

CVE-2026-84287 Medium · 4.3 CWE-404 Sep 1, 2026

NousResearch hermes-agent Session Chat api_server.py denial of service

A flaw has been found in NousResearch hermes-agent 0.18.0. Affected by this issue is some unknown functionality of the file gateway/platforms/api_server.py of the component Session Chat Interface. This manipulation causes denial of service. The attack is possible to be carried out remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-82021 High · 8.3 CWE-494 Aug 28, 2026

Hermes Agent 0.18.2 < 0.19.0 MCP Catalog Supply Chain RCE via Mutable Branch Reference

Hermes Agent 0.18.2 prior to 0.19.0 contains a supply chain vulnerability in its bundled MCP catalog that allows a remote attacker to execute arbitrary code by compromising a third-party upstream repository referenced via a mutable branch rather than a pinned commit SHA. An attacker who compromises the upstream repository can propagate malicious code to every host that installs the affected catalog entry, with no further action required by the operator.

CVE-2026-82020 Medium · 6.8 CWE-552 Aug 28, 2026

Hermes Agent 0.16.0 < 0.17.0 Credential Store Overwrite via File-Write Tool

Hermes Agent 0.16.0 prior to 0.17.0 contains an improper path restriction vulnerability that allows attackers who can influence ingested message content to overwrite the credential store by bypassing sensitive-path guards that excluded the auth.json file. Attackers can craft malicious messages directing the agent's file-write tooling to overwrite the credential store without triggering any path-based protection, enabling credential tampering or unauthorized access.

CVE-2026-18993 Medium · 6.3 CWE-266 Aug 6, 2026

NousResearch hermes-agent Memory Toolset model_tools.py access control

A vulnerability was detected in NousResearch hermes-agent up to 0.16.0. Affected by this issue is some unknown functionality of the file hermes-agent/model_tools.py of the component Memory Toolset. The manipulation results in improper access controls. The attack can be executed remotely. The exploit is now public and may be used.

CVE-2026-18976 Medium · 6.3 CWE-266 Aug 5, 2026

NousResearch hermes-agent disabled_toolsets agent_init.py get_tool_definitions privileges assignment

A vulnerability was determined in NousResearch hermes-agent up to 0.16.0. This impacts the function get_tool_definitions of the file agent/agent_init.py of the component disabled_toolsets Handler. This manipulation causes incorrect privilege assignment. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report.

CVE-2026-18775 Medium · 6.3 CWE-918 Aug 4, 2026

NousResearch hermes-agent Browser Tooling browser_tool.py browser_snapshot server-side request forgery

A vulnerability has been found in NousResearch hermes-agent up to 0.16.0. This vulnerability affects the function browser_snapshot of the file tools/browser_tool.py of the component Browser Tooling. Such manipulation leads to server-side request forgery. The attack may be launched remotely. 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.

CVE-2026-18774 Medium · 6.3 CWE-918 Aug 4, 2026

NousResearch hermes-agent xAI Image Generation Provider image_gen_provider.py save_url_image server-side request forgery

A flaw has been found in NousResearch hermes-agent up to 0.16.0. This affects the function save_url_image of the file agent/image_gen_provider.py of the component xAI Image Generation Provider. This manipulation causes server-side request forgery. The attack may be initiated remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-18773 Medium · 6.3 CWE-285 Aug 4, 2026

NousResearch hermes-agent Quick run.py _check_slash_access authorization

A vulnerability was detected in NousResearch hermes-agent up to 2026.6.5. Affected by this issue is the function _check_slash_access of the file gateway/run.py of the component Quick Command Handler. The manipulation results in incorrect authorization. The attack can be launched remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-17432 Medium · 5.0 CWE-266 Jul 25, 2026

NousResearch hermes-agent SimpleX Gateway Authorization adapter.py access control

A vulnerability was detected in NousResearch hermes-agent 2026.6.5. Affected by this vulnerability is an unknown functionality of the file hermes-agent/plugins/platforms/simplex/adapter.py of the component SimpleX Gateway Authorization. The manipulation of the argument contactId results in improper access controls. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit is now public and may be used. The patch is identified as 490c486ff65b766d9de0fe0e6f26e1778aaa8fb3. Applying a patch is advised to resolve this issue.

CVE-2026-15311 Low · 3.5 CWE-79 Jul 9, 2026

NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting

A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.

CVE-2026-14783 Medium · 4.3 CWE-22 Jul 5, 2026

NousResearch hermes-agent skills_tool.py skill_view path traversal

A vulnerability was determined in NousResearch hermes-agent 2026.5.29.2. The impacted element is the function skill_view of the file tools/skills_tool.py. Executing a manipulation of the argument Name can lead to path traversal. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. This patch is called 56f833efa427ccb444c0f9ad1759af1012f2124d. It is advisable to implement a patch to correct this issue.

CVE-2026-14628 Medium · 5.3 CWE-22 Jul 4, 2026

NousResearch hermes-agent Live Webhook Endpoint base.py extract_media path traversal

A vulnerability was detected in NousResearch hermes-agent up to 2026.5.16. This impacts the function extract_media of the file gateway/platforms/base.py of the component Live Webhook Endpoint. Performing a manipulation results in path traversal. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-14627 Medium · 5.6 CWE-287 Jul 4, 2026

NousResearch hermes-agent Discord Platform Integration discord.py DiscordAdapter._is_allowed_user improper authentication

A security vulnerability has been detected in NousResearch hermes-agent up to 0.15.2. This affects the function DiscordAdapter._is_allowed_user of the file gateway/platforms/discord.py of the component Discord Platform Integration. Such manipulation leads to improper authentication. The attack can be launched remotely. This attack is characterized by high complexity. The exploitability is reported as difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-14626 Medium · 4.3 CWE-404 Jul 4, 2026

NousResearch hermes-agent HTTP API run_agent.py AIAgent.run_conversation denial of service

A weakness has been identified in NousResearch hermes-agent up to 2026.4.30. The impacted element is the function AIAgent.run_conversation of the file run_agent.py of the component HTTP API. This manipulation of the argument todos causes denial of service. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-14625 Medium · 6.3 CWE-693 Jul 4, 2026

NousResearch hermes-agent server.py shell.exec protection mechanism

A security flaw has been discovered in NousResearch hermes-agent up to 0.15.2. The affected element is the function shell.exec of the file tui_gateway/server.py. The manipulation results in protection mechanism failure. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVE-2026-14617 Low · 3.1 CWE-178 Jul 3, 2026

NousResearch hermes-agent Streaming Reasoning Tag Filter stream_consumer.py GatewayStreamConsumer._filter_and_accumulate case sensitivity

A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.30. Affected is the function GatewayStreamConsumer._filter_and_accumulate of the file gateway/stream_consumer.py of the component Streaming Reasoning Tag Filter. The manipulation leads to improper handling of case sensitivity. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is told to be difficult. The exploit has been disclosed publicly and may be used. The project decided to not implement a dedicated fix: "[T]he analysis and the fix are both sound. It just lands below the bar for the maintenance cost of a duplicated scrub path."

CVE-2026-53870 Medium · 5.5 CWE-276 Jun 17, 2026

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

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.

CVE-2026-53869 High · 7.5 CWE-306 Jun 17, 2026

Hermes Agent < 0.16.0 - DNS Rebinding Bypass via WebSocket Endpoints

Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation. FastAPI HTTP middleware does not execute for WebSocket upgrade requests on /api/pty, /api/ws, /api/pub, and /api/events endpoints, enabling attackers to exploit DNS rebinding and inject malicious commands or read terminal output.

CVE-2026-11461 Medium · 6.3 CWE-285 Jun 7, 2026

NousResearch hermes-agent resume Endpoint hermes_state.py resolve_session_by_title authorization

A vulnerability has been found in NousResearch hermes-agent up to 0.12.0. This affects the function resolve_session_by_title of the file hermes_state.py of the component resume Endpoint. Such manipulation of the argument Title leads to authorization bypass. It is possible to launch the attack remotely. 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.