Is CVE-2026-107837 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-107837 being exploited in the wild.

How severe is CVE-2026-107837?

High severity, with a CVSS score of 8.2, published 9 October 2026.

Which products and versions are affected?

Riot-Os Riot 2026.07 and earlier.

Is there a fix for CVE-2026-107837?

A patch was published on 2026-07-28: Fix merged to RIOT master branch via commit 0cae205 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-107837 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-107837?

Check whether you run Riot-Os Riot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-107837: RIOT operating system out-of-bounds read in 6LoWPAN fragment handling

CVE-2026-107837 · Severity: high · CVSS 8.2 · Published 2026-10-09

RIOT is an open-source microcontroller operating system for IoT and embedded devices. A vulnerability in its 6LoWPAN network layer allows a remote attacker to send a malformed packet fragment that crashes the network stack or exposes memory contents without authentication, potentially disrupting device communication and leaking sensitive data.

Technologies: Riot-Os Riot. Vendors: Riot-Os.

Quick answers

Is CVE-2026-107837 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-107837 being exploited in the wild.
How severe is CVE-2026-107837?: High severity, with a CVSS score of 8.2, published 9 October 2026.
Which products and versions are affected?: Riot-Os Riot 2026.07 and earlier.
Is there a fix for CVE-2026-107837?: A patch was published on 2026-07-28: Fix merged to RIOT master branch via commit 0cae205 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-107837 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-107837?: Check whether you run Riot-Os Riot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read exists in gnrc_sixlowpan.c's _receive() function where undersized 6LoWPAN fragment packets are passed to gnrc_sixlowpan_frag_recv() without verifying the packet buffer contains the required fragment header bytes. An unauthenticated remote attacker can send a specially crafted 6LoWPAN fragment over the network to trigger memory disclosure or crash the network stack; the fix adds a size validation helper function sixlowpan_frag_is_snip().

Affected products

RIOT-OS RIOT 2026.07 and earlier

Timeline

2026-10-09: disclosed
2026-07-28: patched: Fix merged to RIOT master branch via commit 0cae205

References

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