CVE-2026-53870

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

6.8 MediumFix 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. 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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.16%Up 0.1 points since Jun 18, 2026

What each source reports

CVE List Score used 6.8

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

Record: CVE-2026-53870
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-276
Updated: 2026-11-02

EUVDEUVD-2026-37775 6.8

Record: EUVD-2026-37775
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-99f9-j8r3-p853 6.8

Hermes Agent creates response_store.db and webhook_subscriptions.json with world-readable permissions (mode 0o644)

Record: GHSA-99f9-j8r3-p853
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-276
Updated: 2026-11-02

NVD 6.8

Record: CVE-2026-53870
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-276
Updated: 2026-11-02

OSV 6.8

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

Record: CVE-2026-53870
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-276
Updated: 2026-11-02

OSVGHSA-99f9-j8r3-p853 6.8

Hermes Agent creates response_store.db and webhook_subscriptions.json with world-readable permissions (mode 0o644)

Record: GHSA-99f9-j8r3-p853
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-276
Updated: 2026-11-02

OSVPYSEC-2026-2511 6.8

Hermes Agent creates response_store.db and webhook_subscriptions.json with world-readable permissions (mode 0o644)

Record: PYSEC-2026-2511
CVSS 4.0: 6.8 MediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated: 2026-11-02

Affected products

nousresearch hermes-agent

Affected packages

Affected packages
Package	Affected	Fixed
`hermes-agent` PyPI	before 0.16.0	0.16.0
`hermes-agent` PyPI	before 0.16.0, plus listed versions 0.13.00.14.00.15.00.15.10.15.2	0.16.0

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-53870 is a medium vulnerability (CVSS 6.8) in Nousresearch Hermes-agent, published June 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. Fixed in hermes-agent 0.16.0.

References

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