---
title: "CVE-2026-107837: RIOT - Out of Bounds Read"
description: "RIOT <= 2026.07 contains an out-of-bounds read caused by insufficient payload validation in _receive() leading to improper sixlowpan_frag_t handling, letting remote attackers cause memory disclosure and network stack crash, exploit requires sending malformed 6LoWPAN fragments."
url: https://panop.io/threat-heartbeat/CVE-2026-107837/
---

# CVE-2026-107837 RIOT - Out of Bounds Read

RIOT <= 2026.07 contains an out-of-bounds read caused by insufficient payload validation in \_receive() leading to improper sixlowpan\_frag\_t handling, letting remote attackers cause memory disclosure and network stack crash, exploit requires sending malformed 6LoWPAN fragments.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107837)

## Details

Type

Out of Bounds Read

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Published

9 October 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to a fixed version once available or apply patches addressing the fragment handling vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107837](https://nvd.nist.gov/vuln/detail/CVE-2026-107837)
- [https://github.com/RIOT-OS/RIOT/commit/0cae205cd1d110e0b8fce094714598322d56ce2d](https://github.com/RIOT-OS/RIOT/commit/0cae205cd1d110e0b8fce094714598322d56ce2d)
- [https://github.com/RIOT-OS/RIOT/pull/22504](https://github.com/RIOT-OS/RIOT/pull/22504)
- [https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-m8mc-q4p7-p8j3](https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-m8mc-q4p7-p8j3)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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