Stack-based Buffer Overflow Affecting espressif/arduino-esp32 package, versions [,3.3.8)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ESPRESSIFARDUINOESP32-16672591
- published14 May 2026
- disclosed12 May 2026
- creditgladiator9797
Introduced: 12 May 2026
CVE-2026-42854 (opens in a new tab)How to fix?
Upgrade espressif/arduino-esp32 to version 3.3.8 or higher.
Overview
Affected versions of this package are vulnerable to Stack-based Buffer Overflow via the WebServer multipart form parser when it allocates a stack-based buffer whose size is determined by an attacker-controlled HTTP header field. An attacker can cause a crash or potentially execute arbitrary code by sending a specially crafted HTTP request with an excessively long boundary string.