CVE-2026-9353 (GCVE-0-2026-9353)

Vulnerability from cvelistv5 – Published: 2026-05-24 03:45 – Updated: 2026-05-26 13:30
VLAI
Title
NousResearch hermes-agent Skills Guard Multi-Word Prompt skills_guard.py injection
Summary
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.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 13:30 UTC
CWE
References
URL Tags
https://vuldb.com/vuln/365316 vdb-entrytechnical-description
https://vuldb.com/vuln/365316/cti signaturepermissions-required
https://vuldb.com/submit/812216 third-party-advisory
https://gist.github.com/YLChen-007/82a3539d635884… exploit
Impacted products
Vendor Product Version CPE status
NousResearch hermes-agent Affected: 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
    cpe:2.3:a:nousresearch:hermes-agent:*:*:*:*:*:*:*:*
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Show details on NVD website

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                  "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",
                "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": "2026-05-24T03:45:07.511Z",
            "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": "2026-05-26T13:30:15.395Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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