CVE-2026-119756 Tasmota 16.0.0 Heap Out-of-Bounds Write via Device Groups UDP
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-119756?
CVE-2026-119756 is a critical vulnerability in arendst Tasmota, published on 9 Nov 2026.
Official description
Tasmota through 16.0.0, fixed in commit e97e1e4, contains a heap out-of-bounds write vulnerability in SendReceiveDeviceGroupMessage() that allows unauthenticated attackers on the local network to corrupt heap memory by sending crafted Device Groups messages over UDP port 4447 that cause the log_remaining counter to go negative and writes to exceed the fixed 512-byte buffer. Attackers can exploit this flaw to crash the device or potentially achieve native code execution on ESP8266 and ESP32 platforms that lack ASLR and heap cookies.
Weakness: CWE-805
Which versions are affected by CVE-2026-119756?
How do I fix CVE-2026-119756?
No fix has been published for CVE-2026-119756 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-119756 being exploited?
There is no known exploitation of CVE-2026-119756 in the wild and no public exploit code.
Sources
Also known as GHSA-6g2f-6p9p-vvm8.