CVE-2026-53870 json
Hermes Agent < 0.16.0 - Sensitive File Permission Vulnerability in Store Files
published 4mo ago modified 3d ago also EUVD-2026-37775 , GHSA-99f9-j8r3-p853 , PYSEC-2026-2511
- cvss
- 5.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi hermes-agent 0.16.0
- NousResearch hermes-agent 0.16.0
Is CVE-2026-53870 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/NousResearch/hermes-agent/pull/30917 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.8 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 6.8 | CVSS: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 |
| OSV | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | hermes-agent | <0.16.0 |
0.16.0 |
Affected products
- NousResearch hermes-agent
Classification
- Weakness
-
- CWE-276 Incorrect Default Permissions
References
-
github.com
/NousResearch/hermes-agent/pull/30917
issue-tracking, patch, exploit, web
-
github.com
/NousResearch/hermes-agent/pull/31469
issue-tracking, patch, web
-
github.com
/NousResearch/hermes-agent/commit/3bace071bfadf2d2bec2ee048471a31ec920e3e8
patch, web
-
github.com
/NousResearch/hermes-agent/releases/tag/v2026.6.5
release-notes, web
-
vulncheck.com
/advisories/hermes-agent-sensitive-file-permission-vulnerability-in-store-files
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-53870
advisory
-
github.com
/NousResearch/hermes-agent
package
-
pypi.org
/project/hermes-agent
package
-
github.com
/advisories/GHSA-99f9-j8r3-p853
advisory
Sources
- CVE List CVE-2026-53870
- GitHub Advisory GHSA-99f9-j8r3-p853
- NVD CVE-2026-53870
- OSV PYSEC-2026-2511
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.