High severity7.5NVD Advisory· Published Jun 10, 2026· Updated Jun 11, 2026
CVE-2026-45541
CVE-2026-45541
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
7(expand)+ 6 more
- (no 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:*:*:*:*:*:*:*
- (no CPE)range: 5.2.6, 5.3.5, 5.4.4, 5.5.4, 6.0
Patches
Vulnerability mechanics
References
7- github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8nvdPatch
- github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6nvdPatch
- github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7nvdPatch
- github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7bnvdPatch
- github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fffnvdPatch
- github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6nvdPatch
- github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8nvdMitigationPatchVendor Advisory
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