NousResearch hermes-agent prompt_builder.py _scan_context_content injection
Published May 24, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.52%
Description
A vulnerability was found in NousResearch hermes-agent 2026.4.23. The impacted element is the function _scan_context_content of the file agent/prompt_builder.py. The manipulation results in injection. The attack may be performed from remote. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Affected products
-
- Version 2026.4.23StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NousResearch | Hermes-Agent | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
2 other sources (CVE.org, NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
1 other source (NVD) ▾
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed May 27, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.52% (0.00516) | 41.85th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.39% (0.00388) | 30.40th | v5 (v2026.06.15) |
| May 24, 2026 | 0.04% (0.00044) | 13.52th | v4 (v2025.03.14) |
References (7)
- https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc exploit
- https://github.com/NousResearch/hermes-agent/commit/0dee92df22bdc0cfbcad90ca954aa14916f018de
- https://github.com/advisories/GHSA-pgp4-xr4j-h5cg Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-9366
- https://vuldb.com/submit/812227 third-party-advisory
- https://vuldb.com/vuln/365329 vdb-entrytechnical-description
- https://vuldb.com/vuln/365329/cti signaturepermissions-required
| Link | Providers | Tags |
|---|---|---|
| https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc | exploit | |
| https://github.com/NousResearch/hermes-agent/commit/0dee92df22bdc0cfbcad90ca954aa14916f018de | ||
| https://github.com/advisories/GHSA-pgp4-xr4j-h5cg | Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-9366 | ||
| https://vuldb.com/submit/812227 | third-party-advisory | |
| https://vuldb.com/vuln/365329 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/365329/cti | signaturepermissions-required |
Change history (0)
No recorded changes yet.