PT-2026-50519 · Nousresearch · Hermes-Agent

Published 2026-06-17 · Updated 2026-06-17 · CVE-2026-53870

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Hermes Agent versions prior to 0.16.0

Description The software creates response store.db and webhook subscriptions.json files with world-readable permissions (mode 0o644). This configuration allows local users with filesystem access to read these files directly, exposing sensitive data such as conversation history, tool payloads, prompts, and per-route HMAC (Hash-based Message Authentication Code) secrets, which are used to verify the integrity and authenticity of messages.

Recommendations Update to version 0.16.0 or later.

Exploit

Fix

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

CVE-2026-53870

Affected Products

Hermes-Agent

References · 6

• 🔥 https://github.com/NousResearch/hermes-agent/pull/30917 · Exploit
• https://github.com/NousResearch/hermes-agent/commit/3bace071bfadf2d2bec2ee048471a31ec920e3e8 · Patch
• https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5 · Note
• https://github.com/NousResearch/hermes-agent/pull/31469 · Note
• https://twitter.com/CVEnew/status/2067350997891006715 · Twitter Post
• https://vulncheck.com/advisories/hermes-agent-sensitive-file-permission-vulnerability-in-store-files · Note