Vulnerability in Nousresearch Hermes-Agent
CVE-2026-53870
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (3.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Nousresearch Hermes-Agent — versions 0, 0.16.0
Weakness classification (CWE)
References
- github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5 (release-notes)
- github.com/NousResearch/hermes-agent/pull/30917 (issue-tracking)
- github.com/NousResearch/hermes-agent/pull/31469 (issue-tracking)
- github.com/NousResearch/hermes-agent/commit/3bace071bfadf2d2bec2ee048471a31ec92… (patch)
- www.vulncheck.com/advisories/hermes-agent-sensitive-file-permission-vulnerabili… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53870?
- CVE-2026-53870 is a medium-severity vulnerability in Nousresearch Hermes-Agent, classified under Incorrect Default Permissions. CVSS score: 5.5/10. Published 2026-06-17.
- How severe is CVE-2026-53870?
- Medium severity. CVSS v3 base score is 5.5 out of 10.