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CVE-2026-5067: zephyr from 3.7.0 (inclusive), through 4.3.0 (inclusive); +1 more affected products
CVE-2026-5067. CVSS 3.1 base score 9.8 (CRITICAL, Vendor/CNA). EPSS 0.00865 (percentile 0.57756), scored 14-Oct-2026.
Affected technology
zephyr · from 3.7.0 (inclusive), through 4.3.0 (inclusive)
zephyrproject
Zephyr · 3.7.0 to before 4.3.1
zephyrproject-rtos
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
Unauthenticated attacker can trigger memory corruption in Zephyr's HTTP server WebSocket upgrade path by sending a crafted Sec-WebSocket-Key header. Vendor/CNA’s CVSS 3.1 assessment (base score 9.8/10) rates confidentiality, integrity and availability impact as high.
- CWE
- CWE-170, CWE-787
- CCR priority
- 39.4 /100 (P4)
- CVSS 3.1
- 9.8 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · Vendor/CNA
- EPSS
- 0.00865 · percentile 0.57756 · 2026-10-14
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-15 23:47:27.763190+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-5067.html