| Título | Arendst Tasmota 15.3.0.3 Memory Corruption |
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| Descrição | A buffer overflow vulnerability exists in Arendst Tasmota firmware
version x.x.x.x and prior in the file tasmota/tasmota_xdrv_driver/
xdrv_10_scripter.ino within the fetch_jpg() function (case 0).
The vulnerable code copies a server-controlled MJPEG boundary string
into a fixed-size 40-byte stack buffer (boundary[40]) using strcpy()
without any length validation:
strcpy(glob_script_mem.jpg_task.boundary, cp + 1);
An attacker who controls the MJPEG HTTP server that the Tasmota device
connects to via fetchjp() script command can send a Content-Type header
with a boundary string longer than 39 characters. This overflows the
boundary[40] buffer and corrupts adjacent heap memory including
WiFiClient vtable pointers, potentially leading to remote code execution
on ESP32-based devices.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (9.8 Critical)
CVE-2026-38422
PoC: https://github.com/sermikr0/CVE-2026-38422 |
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| Fonte | ⚠️ https://github.com/sermikr0/CVE-2026-38422 |
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| Utilizador | sermikro (UID 98509) |
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| Submissão | 25/05/2026 12h25 (há 4 meses) |
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| Moderação | 07/06/2026 21h58 (13 days later) |
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| Estado | Duplicado |
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| Entrada VulDB | 366173 [arendst Tasmota até 15.3.0.3 xdrv_10_scripter.ino fetch_jpg Excesso de tampão] |
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| Pontos | 0 |
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