CVE-2026-76870 [HIGH] – Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd

Netcore NR255-V version 1.5.130703 contains an out-of-bounds read vulnerability in the mtd_write pre-flash validation routine triggered by short firmware uploads. Attackers can upload a truncated firmware image via put_file_cgi.c to trigger out-of-bounds reads across main.c, check_image_uuid.c, and oemMD5Update.c.