FKIE_CVE-2026-45541
Vulnerability from fkie_nvd - Published: 2026-06-10 02:16 - Updated: 2026-06-17 10:52
Severity
Summary
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.
References
{
"affected": [
{
"affectedData": [
{
"product": "esp-idf",
"vendor": "espressif",
"versions": [
{
"status": "affected",
"version": "= 6.0"
},
{
"status": "affected",
"version": "= 5.5.4"
},
{
"status": "affected",
"version": "= 5.4.4"
},
{
"status": "affected",
"version": "= 5.3.5"
},
{
"status": "affected",
"version": "= 5.2.6"
}
]
}
],
"source": "security-advisories@github.com"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:*",
"matchCriteriaId": "37A040C2-E9D4-4678-9A10-74B5AEE4901D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:espressif:esp-idf:5.3.5:*:*:*:*:*:*:*",
"matchCriteriaId": "662FF5D0-F1CA-46B6-B574-46B2B1AE0C27",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:espressif:esp-idf:5.4.4:*:*:*:*:*:*:*",
"matchCriteriaId": "AFFE1121-2E19-45C4-A597-35E029748C99",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:*",
"matchCriteriaId": "2D53A845-578D-4153-BE97-B24E4B75F3BE",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:*",
"matchCriteriaId": "F9D5D616-4CBC-480A-A7CF-4B80D7D3FA17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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",
"lastModified": "2026-06-17T10:52:10.690",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "security-advisories@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-45541",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-10T14:40:06.288007Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-06-10T02:16:32.960",
"references": [
{
"source": "security-advisories@github.com",
"tags": [
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],
"url": "https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8"
},
{
"source": "security-advisories@github.com",
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},
{
"source": "security-advisories@github.com",
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{
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"tags": [
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},
{
"source": "security-advisories@github.com",
"tags": [
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"url": "https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff"
},
{
"source": "security-advisories@github.com",
"tags": [
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"url": "https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6"
},
{
"source": "security-advisories@github.com",
"tags": [
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],
"url": "https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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