CVE-2026-53870Medium· 5.5▾ TwilightPoC available

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

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score42/ 100 · Moderate

impact 30.3 · likelihood 0 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

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Published

Jun 17, 2026

Updated

Oct 8, 2026

CVSS

5.5

Vendor

NousResearch

Product

hermes-agent

CWE

CWE-276

Depth score

42 · Moderate

EPSS

0.16% · p5

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

decided 2026-06-17

Exploitation: poc
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Aug 2.

0.1% → 0.2%▲ 0.05%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

5 events · 131 days

Jun 17, 2026Published
Disclosed via NVD
Aug 2, 2026EPSS first tracked
0.1%
Oct 8, 2026Record revised
Last analysed / modified upstream
Oct 8, 2026Public exploit observed
Exploit / PoC code exists
Oct 26, 2026EPSS peak
0.1% → 0.2%

NousResearch CWE-276 #nvd #cve.org #exploit-available #ghsa #pip

Affected

hermes-agent < 0.16.0

Patched in

hermes-agent 0.16.0

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-53870)

Affected packages:

hermes-agent < 0.16.0

Patched in:

hermes-agent 0.16.0

Source: https://github.com/advisories/GHSA-99f9-j8r3-p853

References

Change history

Field changes observed since this record was first indexed.

Oct 8, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org#exploit-available#ghsa#pip

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