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Vulnerability record · CVE-2026-13351 · published 25 June 2026

CVE-2026-13351: Zephyrproject zephyr vulnerability

Zephyrproject · Zephyr

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.

7.5 CVSS 3.1 High EPSS 0.49% · top 60.6% CWE-772 · CWE-772
7.5CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References, 1 tagged exploit
6 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-cv4q-2j56-4wqf ExploitPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2023-4260Zephyrproject zephyr classic buffer overflow vulnerabilityPotential off-by-one buffer overflow vulnerability in the Zephyr fuse file system.EPSS 0.77%9.8CVE-2026-10666Zephyrproject zephyr stack-based buffer overflow vulnerabilityparse_ipv4() in subsys/net/ip/utils.c (reached via net_ipaddr_parse() for strings of the form "a.b.c.d:port") copies the port substring into a fixed …EPSS 0.65%9.8CVE-2026-5067Zephyrproject zephyr out-of-bounds write vulnerabilityA remote, unauthenticated attacker can trigger memory corruption in Zephyr's HTTP server WebSocket upgrade path by sending a crafted Sec-WebSocket-Ke…EPSS 0.87%9.8CVE-2026-1678Zephyrproject zephyr out-of-bounds write vulnerabilitydns_unpack_name() caches the buffer tailroom once and reuses it while appending DNS labels. As the buffer grows, the cached size becomes incorrect, a…EPSS 0.38%9.8CVE-2023-6881Zephyrproject zephyr classic buffer overflow vulnerabilityPossible buffer overflow in is_mount_pointEPSS 0.44%9.8CVE-2023-6249Zephyrproject zephyr vulnerabilitySigned to unsigned conversion esp32_ipm_sendEPSS 0.44%9.8CVE-2023-5779Zephyrproject zephyr out-of-bounds write vulnerabilitycan: out of bounds in remove_rx_filter functionEPSS 0.44%9.8CVE-2023-6749Zephyrproject zephyr stack-based buffer overflow vulnerabilityUnchecked length coming from user input in settings shellEPSS 0.44%

Source: NIST National Vulnerability Database (record CVE-2026-13351), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.