CVE-2026-38427

HIGH

Tasmota through 15.3.0.3 - Heap Buffer Overflow in fetch_jpg()

Title source: llm

Description

An issue in fetch_jpg() in xdrv_10_scripter.ino in Tasmota through 15.3.0.3 allows a remote attacker to cause heap buffer overflow. The Content-Length from a JPEG stream is stored in a uint16_t variable; values above 65535 wrap around, causing allocation of a smaller buffer than the data actually read.

References (2)

Core 2

Core References

https://github.com/arendst/Tasmota/blob/c207cc2/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino

View Writeup ZIP pw:eip

https://github.com/sermikr0/CVE-2026-38427

View Exploit ZIP pw:eip

Scores

CVSS v3 7.3

EPSS 0.0043

EPSS Percentile 34.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-122

Status published

Published May 27, 2026

Tracked Since May 27, 2026