{"cve":{"cve_id":"CVE-2026-45541","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00439,"epss_percentile":0.34931,"epss_as_of":"2026-06-23","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.","published_at":"2026-06-10T00:25:59.233000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-476"],"nvd_references":["https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8","https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8","https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6","https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7","https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b","https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff","https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:33.078798Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 6.0","version_start_inclusive":true,"version_end":"= 6.0","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 6.0:= 6.0"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.5.4","version_start_inclusive":true,"version_end":"= 5.5.4","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.5.4:= 5.5.4"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.4.4","version_start_inclusive":true,"version_end":"= 5.4.4","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.4.4:= 5.4.4"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.3.5","version_start_inclusive":true,"version_end":"= 5.3.5","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.3.5:= 5.3.5"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.2.6","version_start_inclusive":true,"version_end":"= 5.2.6","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.2.6:= 5.2.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-10T00:25:59.233000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:40.246008Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:40.246008Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:40.246008Z","label":"CVSS score revised","source":"cvelistv5"}]}