EUVD-2026-95931

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. In 2026.07 and earlier, the nanoCoAP client function nanocoapsockgetslice in sys/net/applicationlayer/nanocoap/sock.c accepts a Block2 response when blockcb sees the expecte...

CVE-2026-107836 RIOT: nanoCoAP Block2 client slice handling underflows on inconsistent server-controlled block size

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. In 2026.07 and earlier, the nanoCoAP client function nanocoapsockgetslice in sys/net/applicationlayer/nanocoap/sock.c accepts a Block2 response when blockcb sees the expecte...

CVE-2026-107836

The RIOT microcontroller operating system (version 2026.07 and earlier ) contains a vulnerability in the nanoCoAP client function nanocoap_sock_get_slice() located in sys/net/application_layer/nanocoap/sock.c. The root cause is a failure to verify that server-controlled szx and derived offsets ma...