CVE-2026-107837: high-severity vulnerability in RIOT-OS RIOT
RIOT: Out-of-Bounds Read in RIOT OS 6LoWPAN SFF Fragment Handling
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.2epss 0.4%
RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. In 2026.07 and earlier, _receive() in sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c can route an undersized packet into SFF fragment handling after only a minimal payload check. The code then interprets the packet as a sixlowpan_frag_t or larger fragment header without verifying that the packet snip contains the required bytes. A remote attacker can send a malformed 6LoWPAN fragment that causes gnrc_sixlowpan_frag_recv() to read beyond the packet buffer, potentially disclosing memory and crashing the network stack. No fixed repository release is available as of this review.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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%