9router 0.4.1 through 0.5.99 Config Injection RCE via hermes-settings Endpoint

Advisories

9router 0.4.1 through 0.5.99 Config Injection RCE via hermes-settings Endpoint

severity: high
date: 10/10/2026
Affecting: 9router >= 0.4.1, <= 0.5.99
CVE: CVE-2026-108593
CWE: CWE-94 Improper Control of Generation of Code ('Code Injection')
CVSS: 7.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
References: https://hackmd.io/@haind/9router-hermes-config-injection
https://github.com/decolua/9router/blob/a99cf57239ff778b61e434c2786009d5ed1c412c/src/app/api/cli-tools/hermes-settings/route.js#L20-L35
https://github.com/decolua/9router/blob/a99cf57239ff778b61e434c2786009d5ed1c412c/src/app/api/cli-tools/hermes-settings/route.js#L185-L223
https://github.com/decolua/9router
Credit: HaiND from the Post and Telecommunication Institute of Technology
Description: 9router 0.4.1 through 0.5.99 contains a configuration injection vulnerability in the POST /api/cli-tools/hermes-settings endpoint that allows authenticated dashboard users to inject arbitrary keys into the Hermes Agent config.yaml file. Attackers can submit a baseUrl containing double quotes and newlines to add hooks_auto_accept and a hooks.post_llm_call shell command, which Hermes Agent executes without approval after an LLM call.

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