CVE-2026-42855— arduino-esp32: Digest authentication URI mismatch bypass in WebServer allows cross-resource replay attack

arduino-esp32: Digest authentication URI mismatch bypass in WebServer allows cross-resource replay attack

arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, the WebServer Digest authentication implementation in arduino-esp32 computes the authentication hash using the URI field from the client's Authorization header, without verifying that it matches the actual requested URI. This allows an attacker who possesses any valid digest response (computed for URI-A) to authenticate requests to a completely different protected URI (URI-B), bypassing per-resource access control. This vulnerability is fixed in 3.3.8.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

认证机制不恰当

arduino-esp32 授权问题漏洞

arduino-esp32是Espressif开源的一个用于 ESP32、ESP32-S2、ESP32-S3、ESP32-C3、ESP32-C6 和 ESP32-H2 的 Arduino 内核。 arduino-esp32 3.3.8之前版本存在授权问题漏洞，该漏洞源于WebServer摘要认证实现使用客户端Authorization标头中的URI字段计算认证哈希而不验证其与实际请求URI匹配，可能导致绕过每资源访问控制。

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