CVE WatchOct 16, 2026

CVE-2026-102692

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07

CVSS

9.1

Critical

EPSS

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KEV

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Exploit Today

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0-100

Published: Oct 16, 2026 · Last modified: Oct 16, 2026 · CWE-190 · CWE-787

EPSS · 30d

Not enough EPSS history yet.

Technical description

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, nanocoap accepts oversized CoAP Block2 option values without enforcing the 20-bit maximum block number, allowing block offset multiplication to overflow on 32-bit targets. The affected master baseline is commit aeeae69e; the verified fix is later on master and remains unreleased. The oversized value passes from coap_get_blockopt() to coap_block_slicer_init(). A remote CoAP client can send a malformed Block2 option that produces an invalid slice range and can cause out-of-bounds memory access, denial of service, or memory corruption. This vulnerability is fixed in 2026.07.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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