CVE-2026-107838High· 7.5▾ TwilightRIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. From version 2023.07 through version 2026.07, nanocoap_fileserver callers in sys/net/application_layer/nanocoap/f…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 11.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. From version 2023.07 through version 2026.07, nanocoap_fileserver callers in sys/net/application_layer/nanocoap/fileserver.c ignore a failure returned by _resp_init() when coap_build_reply() cannot fit a response header into the response buffer. A remote client can send a CoAP request with a sufficiently large extended token when nanocoap_token_ext is enabled, causing response initialization to fail while _get_file() or _get_directory() continues with stale response state. The path then reaches _calc_szx2() and its pdu->payload_len > reserve assertion, terminating the affected service or device task. No fixed release is available as of this review.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-49868Critical· 9.8RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap read
CVE-2026-102692Critical· 9.1RIOT: Potential integer overflow in nanocoap Block2 handling leading to out-of-bounds memory access
CVE-2026-102693Critical· 9.6RIOT: Remote Stack Buffer Overflow in ATWINC15x0 driver via unsanitized SSID
CVE-2026-107836High· 7.1RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems
CVE-2026-107837High· 8.2RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems
CVE-2026-56388NoneApache bRPC: Out-of-Bounds Write in Redis Command Parser