esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript

{
  "id": "19aed04c2418ad3ec1c8f63cccaf4abd3376c52fcb7c1ee8a2fe2a7202589b56",
  "url": "https://osv.dev/vulnerability/CVE-2025-65026",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "esm.sh CDN service has JS Template Literal Injection in CSS-to-JavaScript",
    "summary": "esm.sh is a nobuild content delivery network(CDN) for modern web development. Prior to version 136, The esm.sh CDN service contains a Template Literal Injection vulnerability (CWE-94) in its CSS-to-JavaScript module conversion feature. When a CSS file is requested with the ?module query parameter, esm.sh converts it to a JavaScript module by embedding the CSS content directly into a template literal without proper sanitization. An attacker can inject malicious JavaScript code using ${...} expressions within CSS files, which will execute when the module is imported by victim applications. This enables Cross-Site Scripting (XSS) in browsers and Remote Code Execution (RCE) in Electron applications. This issue has been patched in version 136.",
    "evidence": "osv:CVE-2025-65026",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-65026",
      "aliases": [
        "CVE-2025-65026",
        "GHSA-hcpf-qv9m-vfgp",
        "GO-2025-4139"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/esm-dev/esm.sh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1ad31b6352bb0a064ece812f6f360e4850e16051"
                },
                {
                  "fixed": "87d2f6497574bf4448641a5527a3ac2beba5fd6c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:esm:esm.sh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "136"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "87d2f6497574bf4448641a5527a3ac2beba5fd6c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v135_1",
            "v135",
            "v134",
            "v133",
            "v132",
            "v131",
            "v130",
            "v129",
            "v128",
            "v127",
            "v126",
            "v125",
            "v124",
            "v123",
            "v122",
            "v121",
            "v120",
            "v119",
            "v117",
            "v116",
            "v115",
            "v114",
            "v113",
            "v112",
            "v111",
            "v110",
            "v109",
            "v108",
            "v107",
            "v106",
            "v105",
            "v104",
            "v103",
            "v102",
            "v101",
            "v100",
            "v99",
            "v98",
            "v97",
            "v96",
            "v95",
            "v94",
            "v93",
            "v92",
            "v91",
            "v90",
            "v89",
            "v88",
            "v87",
            "v86",
            "v85",
            "v84",
            "v83",
            "v82",
            "v81",
            "v80",
            "v79",
            "v78",
            "v77",
            "v76",
            "v75",
            "v74",
            "v73",
            "v72",
            "v71",
            "v70",
            "v69",
            "v68",
            "v67",
            "v66",
            "v65",
            "v64",
            "v63",
            "v62",
            "v61",
            "v60",
            "v59",
            "v57",
            "v56",
            "v55",
            "v53",
            "v52",
            "v51",
            "v50",
            "v49",
            "v47",
            "v46",
            "v45",
            "v44",
            "v43",
            "v41",
            "v40",
            "v39",
            "v38",
            "v37",
            "v35",
            "v34"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-65026.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.738943122Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/65xxx/CVE-2025-65026.json",
        "https://github.com/esm-dev/esm.sh/security/advisories/GHSA-hcpf-qv9m-vfgp",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-65026",
        "https://github.com/esm-dev/esm.sh/commit/87d2f6497574bf4448641a5527a3ac2beba5fd6c"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-94"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/65xxx/CVE-2025-65026.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-65026",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496791,
  "published_at": "2025-11-19T17:33:11.469+00:00"
}