Hermes Agent 0.16.0 < 0.17.0 Credential Store Overwrite via File-Write Tool

{
  "id": "27f052cb71fbddc24355271f479123f4b72fc0ec9b8aba1a55f912c27d84a6f8",
  "url": "https://osv.dev/vulnerability/CVE-2026-82020",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Hermes Agent 0.16.0 < 0.17.0 Credential Store Overwrite via File-Write Tool",
    "summary": "Hermes Agent 0.16.0 prior to 0.17.0 contains an improper path restriction vulnerability that allows attackers who can influence ingested message content to overwrite the credential store by bypassing sensitive-path guards that excluded the auth.json file. Attackers can craft malicious messages directing the agent's file-write tooling to overwrite the credential store without triggering any path-based protection, enabling credential tampering or unauthorized access.",
    "evidence": "osv:CVE-2026-82020",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-82020",
      "aliases": [
        "CVE-2026-82020"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nousresearch/hermes-agent",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3c231eb3979ab9c57d5cd6d02f1d577a3b718b43"
                },
                {
                  "fixed": "2bd1977d8fad185c9b4be47884f7e87f1add0ce3"
                },
                {
                  "fixed": "da28d5d113956dcf803d5cff552a120740a96a59"
                },
                {
                  "fixed": "2b67e96aec2aa2abd5e94b544cda8e564c75f9f5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "2026.6.5"
                      },
                      {
                        "fixed": "2026.6.19"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2bd1977d8fad185c9b4be47884f7e87f1add0ce3"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2026.6.19"
                  },
                  {
                    "range": [
                      {
                        "fixed": "da28d5d113956dcf803d5cff552a120740a96a59"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2b67e96aec2aa2abd5e94b544cda8e564c75f9f5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2026.6.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82020.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.743561215Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82020.json",
        "https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.19",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82020",
        "https://www.vulncheck.com/advisories/hermes-agent-credential-store-overwrite-via-file-write-tool",
        "https://github.com/NousResearch/hermes-agent/commit/2b67e96aec2aa2abd5e94b544cda8e564c75f9f5",
        "https://github.com/NousResearch/hermes-agent/commit/da28d5d113956dcf803d5cff552a120740a96a59",
        "https://github.com/NousResearch/hermes-agent/pull/45821",
        "https://github.com/NousResearch/hermes-agent"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-552"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0.16.0"
                  },
                  {
                    "fixed": "0.17.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82020.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82020",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507174,
  "published_at": "2026-08-28T18:47:06.377+00:00"
}