CVE-2026-107837 RIOT: Out-of-Bounds Read in RIOT OS 6LoWPAN SFF Fragment Handling
Remote attackers can trigger out-of-bounds reads in RIOT OS 6LoWPAN handling, leading to memory disclosure and network stack crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107837?
CVE-2026-107837 is a high-severity vulnerability in RIOT-OS RIOT, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-107837?
How do I fix CVE-2026-107837?
No fix has been published for CVE-2026-107837 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107837 being exploited?
There is no known exploitation of CVE-2026-107837 in the wild and no public exploit code.
Sources
Also known as GHSA-m8mc-q4p7-p8j3.