CVE-2026-87121

Description

lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.

References

• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-265-01.json
• https://savannah.nongnu.org/projects/lwip
• https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-01