CVE WatchOct 16, 2026

CVE-2026-49868

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

CVSS

9.8

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-125 · CWE-191

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, _parse_reply() in sys/net/application_layer/dhcpv6/client.c omits minimum-length validation before passing IA_PD and IA_NA option bodies to sub-option parsers. A malicious or compromised DHCPv6 server can send a REPLY with an option length smaller than the required structure while MODULE_DHCPV6_CLIENT_IA_PD is enabled, causing _parse_ia_pd_option to read past the option body, size_t underflow, and unbounded out-of-bounds heap reads that can crash the device and may expose or corrupt memory. This issue is fixed in version 2026.07.

Official references

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