{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.12.0"
              },
              {
                "fixed": "1.20.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0d8ad6e1de0f5339e02bc262d6f0df4936974120"
            },
            {
              "fixed": "d19040bda7a8be2f82c3c6e1a5bc03917daee39a"
            },
            {
              "fixed": "84a9f3b9a4f3244b8c8e818f557d64c7b964fb25"
            }
          ],
          "repo": "https://github.com/axios/axios",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4hqw-qxg8-jxx2"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321",
      "CWE-693",
      "CWE-74"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101900.json"
  },
  "details": "Axios is a promise-based HTTP client for the browser and Node.js. From 1.12.0 until 1.20.0, ResolveConfig reads inherited Symbol.toStringTag, append, and getHeaders properties while resolving FormData headers. A separate same-process prototype-pollution flaw supplies an array or non-plain class instance whose inherited properties make it appear FormData-like; plain objects are blocked. The inherited getHeaders function can return attacker-controlled headers that resolveConfig merges into a fetch adapter request. Attacker-controlled headers can alter authorization, cache, metadata-service, or application-specific request behavior. This issue is fixed in version 1.20.0.",
  "id": "CVE-2026-101900",
  "modified": "2026-09-30T03:30:39.099003553Z",
  "published": "2026-09-28T17:14:07.108Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/axios/axios/releases/tag/v1.20.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/101xxx/CVE-2026-101900.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/axios/axios/security/advisories/GHSA-4hqw-qxg8-jxx2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101900"
    },
    {
      "type": "FIX",
      "url": "https://github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/axios/axios/pull/11141"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Axios: Fetch Adapter Header Injection via Inherited FormData getHeaders"
}