CVE-2026-45541

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Source
https://cve.org/CVERecord?id=CVE-2026-45541
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45541.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45541
Aliases
  • GHSA-3j8v-xgrq-5vg8
Published
2026-06-10T00:25:59Z
Modified
2026-08-12T16:24:39Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
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.

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"
}
References

Affected packages

Git / github.com/espressif/esp-idf

Affected ranges

Type
GIT
Repo
https://github.com/espressif/esp-idf
Events
Introduced
9ef24e3e2a2c96e720d83c574a3f8699177573da
Fixed
00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8
Fixed
0dc4ee7537f3b12350f5966cecacd59bba840ec6
Fixed
37508ab91124ef426a7396d30f79eba1162700c7
Fixed
9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b
Fixed
dc46dc51359749e50617eb70d6f9ae298adc4fff
Fixed
f88a47e4f37fb11ae4b0908cd5c80059d83198c6
Database specific
Show details 
{
    "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"
    ]
}

Affected versions

5.*
5.2.6
5.3.5
5.4.4
5.5.4
6.*
6.0
= 5.*
= 5.2.6
= 5.3.5
= 5.4.4
= 5.5.4
= 6.*
= 6.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45541.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "97370956225730433541144957102450771651",
                "247583236580166848860249359671886046731",
                "246056073609474032324716113114809265131",
                "231778820217759859294770262255434393742",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-038a886f",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "244118400018710790748568334796534737934",
            "length": 688
        },
        "id": "CVE-2026-45541-08b31668",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "97370956225730433541144957102450771651",
                "247583236580166848860249359671886046731",
                "246056073609474032324716113114809265131",
                "231778820217759859294770262255434393742",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-16860269",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "97370956225730433541144957102450771651",
                "247583236580166848860249359671886046731",
                "246056073609474032324716113114809265131",
                "231778820217759859294770262255434393742",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-4f27e3a1",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "97370956225730433541144957102450771651",
                "247583236580166848860249359671886046731",
                "246056073609474032324716113114809265131",
                "231778820217759859294770262255434393742",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-72cd03ee",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "244118400018710790748568334796534737934",
            "length": 688
        },
        "id": "CVE-2026-45541-85591a17",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "244118400018710790748568334796534737934",
            "length": 688
        },
        "id": "CVE-2026-45541-8b359188",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "37178973627965117320627794772102626006",
                "97719256207472583722254148861629786942",
                "296634462215992964168505164913565558078",
                "303406198193281921286447752284274933580",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-b444fd30",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "244118400018710790748568334796534737934",
            "length": 688
        },
        "id": "CVE-2026-45541-b68c2bc4",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "68374993837791663302295921114802798207",
                "158035011678057546750895651494869111016",
                "37178973627965117320627794772102626006",
                "97719256207472583722254148861629786942",
                "296634462215992964168505164913565558078",
                "303406198193281921286447752284274933580",
                "59976220456094641226861122524984142144",
                "281170530184043019824164064151643473612",
                "44134595371597138865251450204412831038",
                "38041149787278070336000209871684380332"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-45541-e24af8d6",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "88506217277125940666143534851459715505",
            "length": 690
        },
        "id": "CVE-2026-45541-e24ce76f",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "88506217277125940666143534851459715505",
            "length": 690
        },
        "id": "CVE-2026-45541-f1492139",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6",
        "target": {
            "file": "components/esp_http_server/src/httpd_ws.c",
            "function": "httpd_ws_get_response_subprotocol"
        }
    }
]
vanir_signatures_modified 
"2026-08-12T16:24:39Z"