CVE-2026-45541 (GCVE-0-2026-45541)
Vulnerability from cvelistv5 – Published: 2026-06-10 00:25 – Updated: 2026-06-10 14:40
VLAI
EPSS
VEX
Title
ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
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.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/espressif/esp-idf/security/adv… | x_refsource_CONFIRM |
| https://github.com/espressif/esp-idf/commit/00a2f… | x_refsource_MISC |
| https://github.com/espressif/esp-idf/commit/0dc4e… | x_refsource_MISC |
| https://github.com/espressif/esp-idf/commit/37508… | x_refsource_MISC |
| https://github.com/espressif/esp-idf/commit/9fc0c… | x_refsource_MISC |
| https://github.com/espressif/esp-idf/commit/dc46d… | x_refsource_MISC |
| https://github.com/espressif/esp-idf/commit/f88a4… | x_refsource_MISC |
Impacted products
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"source": "Red Hat CSAF VEX",
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"title": "ESF-IDF: Remote Null Pointer Dereference in WebSocket Server",
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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