RIOT-OS RIOT 2026.04 DHCPv6 Client client.c _parse_reply memory corruption

Summaryinfo

A vulnerability labeled as very critical has been found in RIOT-OS RIOT. Affected is the function _parse_reply of the file sys/net/application_layer/dhcpv6/client.c of the component DHCPv6 Client. Executing a manipulation can lead to memory corruption. The identification of this vulnerability is CVE-2026-49868. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical was found in RIOT-OS RIOT. This vulnerability affects the function _parse_reply of the file sys/net/application_layer/dhcpv6/client.c of the component DHCPv6 Client. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-49868 since 06/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/16/2026).

Upgrading to version 2026.07 eliminates this vulnerability.

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Productinfo

Vendor

• RIOT-OS

Name

• RIOT

Version

• 2026.04

Website

• Product: https://github.com/RIOT-OS/RIOT/

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