CVE-2026-19508: Rdk Rdk-B Webui

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the multipart form-data parser in `jst_post.c` in RDK-B WebUI `rdkb-2025q4-kirkstone.04.10.26` allows a remote unauthenticated attacker to cause memory corruption and denial of service, and potentially execute arbitrary code, via a crafted multipart/form-data request.

Affected products

• Rdk Rdk-B Webui

Published 2026-08-19. Last modified 2026-09-03.