CVE-2026-76787 NULL pointer dereference in the UpdateHub FOTA client when probe metadata omits sha256sum

The UpdateHub firmware-over-the-air client parses the CoAP probe response with Zephyr's JSON library in zimplupdatehubprobe subsys/mgmt/updatehub/updatehub.c. The decoder treats every descriptor field as optional — jsonobjparse returns a bitmask of the fields it actually decoded and never fails o...

CVE-2026-76787

The UpdateHub firmware-over-the-air (FOTA) client in Zephyr is vulnerable to a NULL pointer dereference within the z_impl_updatehub_probe() function. The issue occurs because the JSON decoder treats the sha256sum field as optional; if a network peer omits this string in a CoAP probe response, the...