---
id: CVE-2026-107837
title: >-
  RIOT is an open-source microcontroller operating system designed for Internet
  of Things devices and other embedded systems
summary: >-
  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 undersiz…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T18:17:05.483'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107837'
references:
  - url: >-
      https://github.com/RIOT-OS/RIOT/commit/0cae205cd1d110e0b8fce094714598322d56ce2d
    label: security-advisories@github.com
  - url: 'https://github.com/RIOT-OS/RIOT/pull/22504'
    label: security-advisories@github.com
  - url: 'https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-m8mc-q4p7-p8j3'
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-09T19:09:33.755Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.