Mercury: Unauthenticated Remote Code Execution via /api/kernels

{
  "id": "b16929b9152872755c1f821b9bdeeff16144f60cce39532390d3b6a2afe963cf",
  "url": "https://osv.dev/vulnerability/CVE-2026-111058",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Mercury: Unauthenticated Remote Code Execution via /api/kernels",
    "summary": "Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. Prior to 3.2.6, default tokenless deployments allow anonymous clients to create Jupyter kernels and send execute_request messages containing arbitrary Python. The endpoint blocklist does not cover /api/kernels, and the websocket wrapper previously tracked idle activity without authorizing executable messages. This issue is fixed in version 3.2.6.",
    "evidence": "osv:CVE-2026-111058",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-111058",
      "aliases": [
        "CVE-2026-111058",
        "GHSA-rv4m-xm3f-3ccq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mljar/mercury",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "342cc04d692487ae6fa2683353cb30d8961e8334"
                },
                {
                  "fixed": "73a40ceb0becf057f495a5738ad7f5a5222a53e1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.2.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "73a40ceb0becf057f495a5738ad7f5a5222a53e1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "342cc04d692487ae6fa2683353cb30d8961e8334"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.2.6"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.2.3",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "v3.1.2",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v2.4.3",
            "v2.4.2",
            "v2.4.1",
            "v2.3.10",
            "v2.3.9",
            "v2.3.8",
            "v2.3.6",
            "v2.3.5",
            "v2.3.7",
            "v2.3.1",
            "v2.3.0",
            "v2.2.9",
            "v2.2.8",
            "v2.2.7",
            "v2.2.6",
            "v2.2.1",
            "v2.2.0",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.12",
            "v2.0.10",
            "v2.0.9",
            "v2.0.8",
            "v2.0.7",
            "v2.0.4",
            "v2.0.0",
            "v1.1.6",
            "v1.1.3",
            "v1.1.2",
            "v1.1.1",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v0.8.6",
            "v0.8.0",
            "v0.7.0",
            "v0.6.10",
            "v0.6.8",
            "v0.6.0",
            "v0.5.1",
            "v0.4.1",
            "v0.4.0",
            "v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111058.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.994400363Z",
      "provider": "osv",
      "references": [
        "https://github.com/mljar/mercury/releases/tag/3.2.6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111058.json",
        "https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-111058",
        "https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111058.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-111058",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 511006,
  "published_at": "2026-10-19T16:06:22.646+00:00"
}