{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:*",
              "cpe:2.3:a:espressif:esp-idf:5.3.5:*:*:*:*:*:*:*",
              "cpe:2.3:a:espressif:esp-idf:5.4.4:*:*:*:*:*:*:*",
              "cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:*",
              "cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "5.2.6"
              },
              {
                "last_affected": "5.2.6"
              },
              {
                "introduced": "5.3.5"
              },
              {
                "last_affected": "5.3.5"
              },
              {
                "introduced": "5.4.4"
              },
              {
                "last_affected": "5.4.4"
              },
              {
                "introduced": "5.5.4"
              },
              {
                "last_affected": "5.5.4"
              },
              {
                "introduced": "6.0"
              },
              {
                "last_affected": "6.0"
              }
            ],
            "source": [
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "9ef24e3e2a2c96e720d83c574a3f8699177573da"
            },
            {
              "fixed": "00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8"
            },
            {
              "fixed": "0dc4ee7537f3b12350f5966cecacd59bba840ec6"
            },
            {
              "fixed": "37508ab91124ef426a7396d30f79eba1162700c7"
            },
            {
              "fixed": "9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b"
            },
            {
              "fixed": "dc46dc51359749e50617eb70d6f9ae298adc4fff"
            },
            {
              "fixed": "f88a47e4f37fb11ae4b0908cd5c80059d83198c6"
            }
          ],
          "repo": "https://github.com/espressif/esp-idf",
          "type": "GIT"
        }
      ],
      "versions": [
        "5.2.6",
        "5.3.5",
        "5.4.4",
        "5.5.4",
        "6.0",
        "= 5.2.6",
        "= 5.3.5",
        "= 5.4.4",
        "= 5.5.4",
        "= 6.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-3j8v-xgrq-5vg8"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45541.json"
  },
  "details": "ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esp_http_server component. While parsing the client-supplied Sec-WebSocket-Protocol request header during the WebSocket handshake, the tokenisation result is dereferenced without a NULL check, so a malformed header value can crash the server before any application-level authentication runs. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.",
  "id": "CVE-2026-45541",
  "modified": "2026-07-08T05:37:04.635232698Z",
  "published": "2026-06-10T00:25:59.233Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45541.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45541"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff"
    },
    {
      "type": "FIX",
      "url": "https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ESF-IDF: Remote Null Pointer Dereference in WebSocket Server"
}