{"cve":{"cve_id":"CVE-2026-25532","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":0.00213,"epss_percentile":0.11471,"epss_as_of":"2026-06-23","description":"ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation where malformed EAP-WSC packets with truncated payloads can cause integer underflow during fragment length calculation. When processing EAP-Expanded (WSC) messages, the code computes frag_len by subtracting header sizes from the total packet length. If an attacker sends a packet where the EAP Length field covers only the header and flags but omits the expected payload (such as the 2-byte Message Length field when WPS_MSG_FLAG_LEN is set), frag_len becomes negative. This negative value is then implicitly cast to size_t when passed to wpabuf_put_data(), resulting in a very large unsigned value. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.","published_at":"2026-02-04T17:58:08.100000Z","last_modified_at":null,"cvss_v3_score":6.3,"cvss_v3_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","cvss_v3_severity":"MEDIUM","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-191"],"nvd_references":["https://github.com/espressif/esp-idf/security/advisories/GHSA-m2h2-683f-9mw7","https://github.com/espressif/esp-idf/commit/60f992a26de17bb5406f2149a2f8282dd7ad1c59","https://github.com/espressif/esp-idf/commit/6f6766f917bc940ffbcc97eac4765a6ab15d5f79","https://github.com/espressif/esp-idf/commit/73a587d42a57ece1962b6a4c530b574600650f63","https://github.com/espressif/esp-idf/commit/b209fae993d795255827ce6b2b0d6942a377f5d4","https://github.com/espressif/esp-idf/commit/b88befde6b5addcdd8d7373ce55c8052dea1e855","https://github.com/espressif/esp-idf/commit/cad36beb4cde27abcf316cd90d8d8dddbc6f213a","https://github.com/espressif/esp-idf/commit/de28801e8ea6a736b6f0db6fc0c682739363bb41"],"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":"2026-06-28T23:29:25.440717Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"A","value_label":"Adjacent"},{"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":"R","value_label":"Required"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"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":"= 5.5.2","version_start_inclusive":true,"version_end":"= 5.5.2","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.5.2:= 5.5.2"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.4.3","version_start_inclusive":true,"version_end":"= 5.4.3","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.4.3:= 5.4.3"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.3.4","version_start_inclusive":true,"version_end":"= 5.3.4","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.3.4:= 5.3.4"},{"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"},{"vendor_slug":"espressif","vendor_name":"espressif","product_slug":"esp-idf","product_name":"esp-idf","version_start":"= 5.1.6","version_start_inclusive":true,"version_end":"= 5.1.6","version_end_inclusive":true,"cpe23_uri":"cve5:espressif:esp-idf:= 5.1.6:= 5.1.6"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-m2h2-683f-9mw7","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/espressif/esp-idf/commit/60f992a26de17bb5406f2149a2f8282dd7ad1c59","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/6f6766f917bc940ffbcc97eac4765a6ab15d5f79","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/73a587d42a57ece1962b6a4c530b574600650f63","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/b209fae993d795255827ce6b2b0d6942a377f5d4","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/b88befde6b5addcdd8d7373ce55c8052dea1e855","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/cad36beb4cde27abcf316cd90d8d8dddbc6f213a","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/espressif/esp-idf/commit/de28801e8ea6a736b6f0db6fc0c682739363bb41","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-02-04T17:58:08.100000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:52:12.012794Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:12.012794Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:52:12.012794Z","label":"CVSS score revised","source":"cvelistv5"}]}