CVE-2026-119756
Tasmota 16.0.0 Heap Out-of-Bounds Write via Device Groups UDP
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-805 |
| Vendor | arendst |
| Product | tasmota |
| Published | Nov 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
arendst / Tasmota
0 ≤ 16.0.0
References
Credits
Abdurakhmonov Ulugbek