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CVE-2026-9353

📛 CVE Title

NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection

⬇ Download JSON ⚠ View as Threat

Description

A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.23. Impacted is an unknown function of the file agent/skills_guard.py of the component Skills Guard Multi-Word Prompt Handler. The manipulation of the argument THREAT_PATTERNS leads to injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may 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
CVSS 6.9 / 10 6.9 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 03:45 UTC
Last updated
2026-05-24 03:45 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/9xxx/CVE-2026-9353.json
Linked Threat
CVE-2026-9353 — CVE-2026-9353

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 00:17 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-2026-31567
Assigner
VulDB
Published
May 24, 2026, 3:45:07 AM
Updated
May 26, 2026, 1:30:15 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 (2026.4.21)
hermes-agent (2026.4.4)
hermes-agent (2026.4.12)
hermes-agent (2026.4.9)
hermes-agent (2026.4.23)
hermes-agent (2026.4.7)
hermes-agent (2026.4.19)
hermes-agent (2026.4.15)
hermes-agent (2026.4.16)
hermes-agent (2026.4.13)
hermes-agent (2026.4.0)
hermes-agent (2026.4.1)
hermes-agent (2026.4.20)
hermes-agent (2026.4.17)
hermes-agent (2026.4.5)
hermes-agent (2026.4.18)
hermes-agent (2026.4.14)
hermes-agent (2026.4.2)
hermes-agent (2026.4.3)
hermes-agent (2026.4.6)
hermes-agent (2026.4.10)
hermes-agent (2026.4.8)
hermes-agent (2026.4.11)
hermes-agent (2026.4.22)
Aliases
GHSA-238w-f66p-w349

ENISA description: A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.23. Impacted is an unknown function of the file agent/skills_guard.py of the component Skills Guard Multi-Word Prompt Handler. The manipulation of the argument THREAT_PATTERNS leads to injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

EUVD references (4)

Affected products (1)
VendorProductVersionsPlatforms
NousResearch hermes-agent 2026.4.0 (affected), 2026.4.1 (affected), 2026.4.2 (affected), 2026.4.3 (affected), 2026.4.4 (affected), 2026.4.5 (affected), 2026.4.6 (affected), 2026.4.7 (affected), 2026.4.8 (affected), 2026.4.9 (affected), 2026.4.10 (affected), 2026.4.11 (affected), 2026.4.12 (affected), 2026.4.13 (affected), 2026.4.14 (affected), 2026.4.15 (affected), 2026.4.16 (affected), 2026.4.17 (affected), 2026.4.18 (affected), 2026.4.19 (affected), 2026.4.20 (affected), 2026.4.21 (affected), 2026.4.22 (affected), 2026.4.23 (affected) —

Vendor references (4)

References embedded in the original CVE record by the assigning CNA.

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.

Remediations (16)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

  • CVE-2026-9353 - Vulnerability Details - OpenCVE
    web:app.opencve.io

    A security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.23. Impacted is an unknown function of the file agent/skills_guard.py of the component Skills Guard Multi-Word Prompt Handler. The manipulation of the argument THREAT_PATTERNS leads to injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor ...

    2026-05-26 03:09 UTC
  • Microsoft Patch Tuesday for May 2026 — Snort rules and prominent ...
    web:blog.talosintelligence.com

    Microsoft has released its monthly security update for May 2026 , which includes 137 vulnerabilities affecting a range of products, including 16 that Microsoft marked as "critical".

    2026-05-26 03:09 UTC
  • Security Advisory Bulletin 064 | Ubiquiti Community
    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 ...

    2026-05-26 03:09 UTC
  • CVE-2026-3593: Heap use-after-free vulnerability in BIND 9 DNS-over ...
    web:kb.isc.org

    A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.

    2026-05-26 03:09 UTC
  • Security Update Guide - Microsoft
    web:msrc.microsoft.com

    The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

    2026-05-26 03:09 UTC
  • Nvd - Cve-2026-3593
    web:nvd.nist.gov

    An official website of the United States government Here's how you know

    2026-05-26 03:09 UTC
  • April 2026 Patch Tuesday: Updates and Analysis | CrowdStrike
    web:www.crowdstrike.com

    Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.

    2026-05-26 03:09 UTC
  • Emergency patch issued for Microsoft Office, 365 over hacking threat - MSN
    web:www.msn.com

    Original story: Microsoft has released an emergency patch for a vulnerability in the company's Office programs that's already being exploited by hackers.

    2026-05-26 03:09 UTC
  • Oracle Critical Patch Update Advisory - April 2026
    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.

    2026-05-26 03:09 UTC
  • Patch Tuesday May 2026: Security Updates & CVE Analysis
    web:zecurit.com

    Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

    2026-05-26 03:09 UTC
  • Microsoft addresses 137 vulnerabilities in May's Patch Tuesday ...
    web:cyberscoop.com

    Threats Microsoft addresses 137 vulnerabilities in May's Patch Tuesday, including 13 rated critical The high volume of vulnerabilities reflects a growing trend researchers have been anticipating as artificial intelligence models are deployed to find previously uncovered defects in code.

    2026-06-03 22:32 UTC
  • Microsoft Patch Tuesday May 2026 - 120 Vulnerabilities Fixed, Including ...
    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
  • Security Update Guide - Microsoft
    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.

    2026-06-03 22:32 UTC
  • Microsoft Issues Second Biggest Patch Tuesday Ever in April
    web:redmondmag.com

    Microsoft April 2026 Patch Tuesday fixed 163 CVEs , marking its second-largest security update. Three zero-day vulnerabilities impacted SharePoint, Chromium-based Edge workflows and Microsoft Defender.

    2026-06-03 22:32 UTC
  • Landing Page | ServiceNow Common Vulnerabilities & Exposures (CVE ...
    web:support.servicenow.com

    Overview The advisories below document publicly disclosed Common Vulnerabilities and Exposures ( CVEs ) in the Now Platform by ServiceNow. Because ServiceNow uses various methods to communicate vulnerability information, patches, and other fixes, customers should review family, security patch , and hotfix release notes, which are available at https://docs.servicenow.com, for a complete list of ...

    2026-06-03 22:32 UTC
  • CVE: Common Vulnerabilities and Exposures
    web:www.cve.org

    At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

    2026-06-03 22:32 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-9353.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "Skills Guard Multi-Word Prompt Handler"
          ],
          "product": "hermes-agent",
          "vendor": "NousResearch",
          "versions": [
            {
              "status": "affected",
              "version": "2026.4.0"
            },
            {
              "status": "affected",
              "version": "2026.4.1"
            },
            {
              "status": "affected",
              "version": "2026.4.2"
            },
            {
              "status": "affected",
              "version": "2026.4.3"
            },
            {
              "status": "affected",
              "version": "2026.4.4"
            },
            {
              "status": "affected",
              "version": "2026.4.5"
            },
            {
              "status": "affected",
              "version": "2026.4.6"
            },
            {
              "status": "affected",
              "version": "2026.4.7"
            },
            {
              "status": "affected",
              "version": "2026.4.8"
            },
            {
              "status": "affected",
              "version": "2026.4.9"
            },
            {
              "status": "affected",
              "version": "2026.4.10"
            },
            {
              "status": "affected",
              "version": "2026.4.11"
            },
            {
              "status": "affected",
              "version": "2026.4.12"
            },
            {
              "status": "affected",
              "version": "2026.4.13"
            },
            {
              "status": "affected",
              "version": "2026.4.14"
            },
            {
              "status": "affected",
              "version": "2026.4.15"
            },
            {
              "status": "affected",
              "version": "2026.4.16"
            },
            {
              "status": "affected",
              "version": "2026.4.17"
            },
            {
              "status": "affected",
              "version": "2026.4.18"
            },
            {
              "status": "affected",
              "version": "2026.4.19"
            },
            {
              "status": "affected",
              "version": "2026.4.20"
            },
            {
              "status": "affected",
              "version": "2026.4.21"
            },
            {
              "status": "affected",
              "version": "2026.4.22"
            },
            {
              "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 security vulnerability has been detected in NousResearch hermes-agent up to 2026.4.23. Impacted is an unknown function of the file agent/skills_guard.py of the component Skills Guard Multi-Word Prompt Handler. The manipulation of the argument THREAT_PATTERNS leads to injection. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may 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",
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            "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": "2026-05-24T03:45:07.511Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-365316 | NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/365316"
        },
        {
          "name": "VDB-365316 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/365316/cti"
        },
        {
          "name": "Submit #812216 | NousResearch hermes-agent 2026.4.23 Injection (CWE-74)",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/812216"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://gist.github.com/YLChen-007/82a3539d6358842e69dfaef0a9fcf14a"
        }
      ],
      "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": "2026-05-23T11:24:54.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-9353",
    "datePublished": "2026-05-24T03:45:07.511Z",
    "dateReserved": "2026-05-23T09:19:38.292Z",
    "dateUpdated": "2026-05-24T03:45:07.511Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}