CVE-2026-13351
net: Maliciously fragmented IPv6 packets can prevent receiving/processing future incoming packets
Description
Zephyr's IPv6 network stack can be prevented from receiving or processing future incoming packets by sending a small number of maliciously fragmented IPv6 packets. When such a packet is handled by the fragment-header processing path, the associated RX network packet buffer (allocated from a memory slab) is not released back to the pool. Repeating the malicious packet exhausts all RX buffer slots, after which the device can no longer obtain RX buffers and stops receiving traffic, resulting in a denial of service.
INFO
Published Date :
June 25, 2026, 5:16 p.m.
Last Modified :
Oct. 25, 2026, 10:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-13351
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | e2e69745-5e70-4e92-8431-deb5529a81ad | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Zephyr's IPv6 network stack.
- Ensure fragment header processing is secure.
- Monitor network buffer usage.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-13351.
| URL | Resource |
|---|---|
| https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf | Exploit Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-13351 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-13351
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13351 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-13351 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: Zephyr de zephyrproject-rtos, Description: La pila de red IPv6 de Zephyr puede impedirse que reciba o procese futuros paquetes entrantes mediante el envío de un pequeño número de paquetes IPv6 fragmentados maliciosamente. Cuando dicho paquete es manejado por la ruta de procesamiento del encabezado de fragmento, el búfer de paquetes de red RX asociado (asignado de un slab de memoria) no se libera de nuevo a la reserva. Repetir el paquete malicioso agota todas las ranuras del búfer RX, después de lo cual el dispositivo ya no puede obtener búferes RX y deja de recibir tráfico, lo que resulta en una denegación de servicio. -
CVE Modified by [email protected]
Oct. 15, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/13xxx/CVE-2026-13351.json">CVE-2026-13351</a> Added Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf Removed Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf Removed Reference Type https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf Types: Exploit, Patch, Vendor Advisory -
Initial Analysis by [email protected]
Jul. 06, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:zephyrproject:zephyr:*:*:*:*:*:*:*:* versions up to (including) 4.4.1 Added Reference Type Zephyr Project: https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf Types: Exploit, Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 25, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-13351', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-25T18:00:39.412711Z'} -
New CVE Received by [email protected]
Jun. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/zephyrproject-rtos/zephyr', 'vendor': 'zephyrproject-rtos', 'product': 'Zephyr', 'versions': [{'status': 'affected', 'version': '*', 'versionType': 'git', 'lessThanOrEqual': '4.3'}], 'packageName': 'Zephyr', 'defaultStatus': 'unaffected'}] Added Description Zephyr's IPv6 network stack can be prevented from receiving or processing future incoming packets by sending a small number of maliciously fragmented IPv6 packets. When such a packet is handled by the fragment-header processing path, the associated RX network packet buffer (allocated from a memory slab) is not released back to the pool. Repeating the malicious packet exhausts all RX buffer slots, after which the device can no longer obtain RX buffers and stops receiving traffic, resulting in a denial of service. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-772 Added Reference https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf