CVE-2026-8369: Input Validation in OpenThread
Platform
linux
Component
openthread
Fixed in
0.17.0
CVE-2026-8369 describes an improper input validation vulnerability within the NAT64 translator of OpenThread, impacting versions prior to commit 26a882d. This flaw allows attackers on the same IPv4 network to inject malicious IPv6 packets into the Thread mesh, potentially disrupting operations and bypassing security mechanisms. The vulnerability is fixed in version 0.17.0, and users are advised to upgrade promptly.
Impact and Attack Scenarios
The core impact of CVE-2026-8369 lies in the ability of an attacker to manipulate IPv6 traffic within the OpenThread mesh. By injecting corrupted packets, an attacker could disrupt the network's functionality, causing devices to disconnect or malfunction. More critically, the vulnerability allows bypassing of security checks, potentially enabling unauthorized access to devices and data within the Thread network. This could lead to data breaches, device compromise, and even complete control of the mesh network. The adjacent IPv4 network requirement limits the immediate blast radius, but shared network infrastructure could expand the potential attack surface.
Exploitation Context
CVE-2026-8369 was published on 2026-05-13. Severity is pending evaluation. No public proof-of-concept exploits are currently known. The vulnerability affects the NAT64 translator, a component critical for IPv6 connectivity in Thread networks, making it a potentially attractive target. It is not currently listed on KEV or EPSS.
Threat Intelligence
Exploit Status
CISA SSVC
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
Mitigation and Workarounds
The primary mitigation for CVE-2026-8369 is upgrading to OpenThread version 0.17.0 or later. If an immediate upgrade is not feasible, consider implementing network segmentation to isolate the OpenThread mesh from untrusted IPv4 networks. This can be achieved through firewall rules or VLANs. Monitoring network traffic for unusual IPv6 packet patterns originating from the IPv4 network is also recommended. While no specific detection signatures are available, analyzing packet captures for malformed IPv6 headers or unexpected options can provide early warning signs. After upgrading, verify the fix by attempting to inject a crafted IPv4 packet with options and confirming that the NAT64 translator correctly rejects it.
How to fix
Actualice a la versión 0.17.0 o posterior para mitigar la vulnerabilidad. Esta actualización corrige la validación de entrada incorrecta en el traductor NAT64, previniendo la inyección de paquetes corruptos y el bypass de controles de seguridad.
Frequently asked questions
What is CVE-2026-8369 — Input Validation in OpenThread?
CVE-2026-8369 is a vulnerability in OpenThread affecting versions up to commit 26a882d. It allows attackers on an adjacent IPv4 network to inject corrupted IPv6 packets, potentially disrupting the Thread mesh and bypassing security checks.
Am I affected by CVE-2026-8369 in OpenThread?
If you are using OpenThread prior to commit 26a882d, you are potentially affected. Check your OpenThread version using git log -1 --pretty=format:'%H' and upgrade to 0.17.0 or later if necessary.
How do I fix CVE-2026-8369 in OpenThread?
The recommended fix is to upgrade to OpenThread version 0.17.0 or later. If upgrading is not immediately possible, implement network segmentation to isolate the Thread mesh from untrusted IPv4 networks.
Is CVE-2026-8369 being actively exploited?
Currently, there are no known active campaigns or public proof-of-concept exploits for CVE-2026-8369, but the vulnerability's nature warrants proactive mitigation.
Where can I find the official OpenThread advisory for CVE-2026-8369?
Refer to the OpenThread project's official communication channels and security advisories for the latest information regarding CVE-2026-8369. Check the OpenThread GitHub repository for updates.
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