🛡️ CVE-2026-42855
🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-287 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-287
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-12
Updated 2026-06-02
Modified 2026-05-15
Fix URL N/A

Affected Packages

Software From version Fixed in
arduino-esp32 — 3.3.8
unknown — —

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