{"id":"CVE-2026-25532","state":"PUBLISHED","title":"ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow","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.","publishedAt":"2026-02-04T17:58:08.100Z","updatedAt":"2026-02-04T19:24:47.749Z","severity":{"score":6.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["espressif esp-idf"],"affected":[{"vendor":"espressif","product":"esp-idf","versions":[{"version":"= 5.5.2","status":"affected"},{"version":"= 5.4.3","status":"affected"},{"version":"= 5.3.4","status":"affected"},{"version":"= 5.2.6","status":"affected"},{"version":"= 5.1.6","status":"affected"}]}],"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"],"weaknesses":["CWE-191"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25532.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25532","state":"PUBLISHED","datePublished":"2026-02-04T17:58:08.100Z","dateUpdated":"2026-02-04T19:24:47.749Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-02T19:59:47.373Z"},"containers":{"cna":{"title":"ESF-IDF is Vulnerable to WPS Enrollee Fragment Integer Underflow","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"espressif","product":"esp-idf","versions":[{"version":"= 5.5.2","status":"affected"},{"version":"= 5.4.3","status":"affected"},{"version":"= 5.3.4","status":"affected"},{"version":"= 5.2.6","status":"affected"},{"version":"= 5.1.6","status":"affected"}]}],"references":[{"url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-m2h2-683f-9mw7","name":"https://github.com/espressif/esp-idf/security/advisories/GHSA-m2h2-683f-9mw7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/espressif/esp-idf/commit/60f992a26de17bb5406f2149a2f8282dd7ad1c59","name":"https://github.com/espressif/esp-idf/commit/60f992a26de17bb5406f2149a2f8282dd7ad1c59","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/6f6766f917bc940ffbcc97eac4765a6ab15d5f79","name":"https://github.com/espressif/esp-idf/commit/6f6766f917bc940ffbcc97eac4765a6ab15d5f79","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/73a587d42a57ece1962b6a4c530b574600650f63","name":"https://github.com/espressif/esp-idf/commit/73a587d42a57ece1962b6a4c530b574600650f63","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/b209fae993d795255827ce6b2b0d6942a377f5d4","name":"https://github.com/espressif/esp-idf/commit/b209fae993d795255827ce6b2b0d6942a377f5d4","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/b88befde6b5addcdd8d7373ce55c8052dea1e855","name":"https://github.com/espressif/esp-idf/commit/b88befde6b5addcdd8d7373ce55c8052dea1e855","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/cad36beb4cde27abcf316cd90d8d8dddbc6f213a","name":"https://github.com/espressif/esp-idf/commit/cad36beb4cde27abcf316cd90d8d8dddbc6f213a","tags":["x_refsource_MISC"]},{"url":"https://github.com/espressif/esp-idf/commit/de28801e8ea6a736b6f0db6fc0c682739363bb41","name":"https://github.com/espressif/esp-idf/commit/de28801e8ea6a736b6f0db6fc0c682739363bb41","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-191","lang":"en","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-04T17:58:08.100Z"},"source":{"advisory":"GHSA-m2h2-683f-9mw7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-04T19:24:33.788979Z","id":"CVE-2026-25532","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-04T19:24:47.749Z"}}]}}}