CVE-2026-49868
RIOT is an open-source microcontroller operating system designed for Internet of Things devices and…
- Risk score
- 70/100
- CVSS
- 9.8 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 16 Oct 2026
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What to know
- What it is
- 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 co…
- Affected
- See advisory
- Fix
- Upgrade the product to 2026.07 or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.8 critical
- Remotely exploitable without logging in
References
Original 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.
Last activity 16 Oct 2026. Patch Forecast updates every hour.