CVE-2026-49868: critical vulnerability in RIOT-OS RIOT
RIOT: DHCPv6 client _parse_reply() missing sub-option length check leads to size_t underflow and unbounded OOB heap read
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.8epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
RIOT-OS · RIOTRelated CVEs — RIOT-OS RIOT
In the same product, most dangerous first.
CVE-2024-32017CRITICALBuffer overflows in RIOTEPSS 1.6%CVE-2024-32018HIGHIneffective size check due to assert() and buffer overflow in RIOTEPSS 1.5%CVE-2023-33975CRITICALRIOT-OS vulnerable to Out of Bounds Write in _rbuf_addEPSS 1.5%CVE-2024-31225HIGHLack of size check and buffer overflow in RIOTEPSS 1.3%CVE-2023-24818HIGHRIOT-OS vulnerable to null pointer dereference during fragment forwardingEPSS 1.2%CVE-2023-24823CRITICALRIOT-OS vulnerable to Packet Type Confusion during IPHC sendEPSS 1.0%