CVE-2026-9366
📛 CVE Title
NousResearch hermes-agent prompt_builder.py _scan_context_content injection
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.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- VulDB
- CVSS severity
- MEDIUM
- CVSS score
- 6.9 / 10
- CVSS vector
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- Effective score
- 6.9 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-74,CWE-707 - Reserved
- 2026-05-23
- Published
- 2026-05-24 08:15 UTC
- Last updated
- 2026-05-24 08:15 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/9xxx/CVE-2026-9366.json
- Linked Threat
- CVE-2026-9366 — CVE-2026-9366
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- EPSS score
- 0.0004 (probability of exploitation in next 30 days)
- EPSS percentile
- 13.52% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD / KEV / EPSS data refreshed 2026-05-25 00:16 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-31580 - Assigner
- VulDB
- Published
- May 24, 2026, 8:15:09 AM
- Updated
- May 27, 2026, 5:27:32 PM
- EUVD base score (CVSS 4.0)
-
6.9 / 10
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 - EUVD-reported EPSS
- 0.0600
- Vendors
- NousResearch
- Products
-
hermes-agent (2026.4.23)
- Aliases
-
GHSA-pgp4-xr4j-h5cg
ENISA 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 (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| NousResearch | hermes-agent |
2026.4.23 (affected)
|
— |
Vendor references (4)
References embedded in the original CVE record by the assigning CNA.
- VDB-365329 | NousResearch hermes-agent prompt_builder.py _scan_context_content injection vdb-entrytechnical-description
- VDB-365329 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
- Submit #812227 | NousResearch hermes-agent 2026.4.23 Injection (CWE-74) third-party-advisory
- https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc exploit
Web references (7)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc tenable:gist.github.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-9366 tenable:nvd.nist.gov
- https://vuldb.com/submit/812227 tenable:vuldb.com
- https://vuldb.com/vuln/365329 tenable:vuldb.com
- https://vuldb.com/vuln/365329/cti tenable:vuldb.com
- https://www.cve.org/CVERecord?id=CVE-2026-9366 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:community.ui.com
Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...
2026-05-24 14:50 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-24 14:50 UTC -
web:windows101tricks.com
Microsoft's April 2026 Patch Tuesday update, released on April 14, 2026 , addresses 167 vulnerabilities, including two actively exploited zero-days and eight critical flaws. The update primarily targets Windows 10/11, Microsoft Office, SharePoint Server, and .NET Framework, and fixes issues such as Remote Code Execution (RCE) and Elevation of Privilege (EoP).
2026-05-24 14:50 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
2026-05-24 14:50 UTC -
web:www.cisecurity.org
<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...
2026-05-24 14:50 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-05-24 14:50 UTC -
web:www.notebookcheck.net
Microsoft's Windows 11 KB5083769 April 2026 update causes critical boot failures, pixelated BSODs, and BitLocker recovery loops on Windows 11 24H2 and 25H2 PCs.
2026-05-24 14:50 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-24 14:50 UTC -
web:www.windowslatest.com
Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.
2026-05-24 14:50 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-24 14:50 UTC -
web:blog.qualys.com
May 2026's Patch Tuesday arrives with Microsoft addressing a fresh set of vulnerabilities across its ecosystem, reinforcing the ongoing need for timely patching in an increasingly threat-heavy…
2026-06-03 22:32 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-03 22:32 UTC -
web:thecyberexpress.com
Microsoft has rolled out its May 2026 Patch Tuesday security updates, delivering fixes for approximately 120 vulnerabilities across Windows, Microsoft Office, networking services, and enterprise platforms.
2026-06-03 22:32 UTC -
web:www.lansweeper.com
Which vulnerabilities, issues, and other things did Microsoft update? Discover what's new using Lansweeper's Patch Tuesday May 2026 summary.
2026-06-03 22:32 UTC -
web:www.ntcompatible.com
Microsoft's March 2026 security updates include 83 new CVE fixes affecting various products, including Windows Server core services and Azure IoT Explorer. The most critical patch is a CVE -rated 9.
2026-06-03 22:32 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-03 22:32 UTC -
web:www.windowslatest.com
Windows 11 March 2026 Patch Tuesday update adds Emoji 16.0, Sysmon, network speed test, reliability improvements, and security fixes.
2026-06-03 22:32 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-9366.json.
{
"containers": {
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"
],
"product": "hermes-agent",
"vendor": "NousResearch",
"versions": [
{
"status": "affected",
"version": "2026.4.23"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Eric-i (VulDB User)"
},
{
"lang": "en",
"type": "coordinator",
"value": "VulDB CNA Team"
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"vectorString": "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",
"version": "4.0"
}
},
{
"cvssV3_1": {
"baseScore": 7.3,
"baseSeverity": "HIGH",
"vectorString": "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",
"version": "3.1"
}
},
{
"cvssV3_0": {
"baseScore": 7.3,
"baseSeverity": "HIGH",
"vectorString": "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",
"version": "3.0"
}
},
{
"cvssV2_0": {
"baseScore": 7.5,
"vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR",
"version": "2.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-74",
"description": "Injection",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-707",
"description": "Improper Neutralization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-24T08:15:09.911Z",
"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-365329 | NousResearch hermes-agent prompt_builder.py _scan_context_content injection",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/vuln/365329"
},
{
"name": "VDB-365329 | CTI Indicators (IOB, IOC, TTP, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/vuln/365329/cti"
},
{
"name": "Submit #812227 | NousResearch hermes-agent 2026.4.23 Injection (CWE-74)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/812227"
},
{
"tags": [
"exploit"
],
"url": "https://gist.github.com/YLChen-007/581fd92de5548fbaacb2092e848a75cc"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-05-23T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
"lang": "en",
"time": "2026-05-23T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-05-23T12:38:23.000Z",
"value": "VulDB entry last update"
}
],
"title": "NousResearch hermes-agent prompt_builder.py _scan_context_content injection"
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-9366",
"datePublished": "2026-05-24T08:15:09.911Z",
"dateReserved": "2026-05-23T10:33:09.869Z",
"dateUpdated": "2026-05-24T08:15:09.911Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}