CVE-2026-18796— QSPI flash encryption side-channel leakage
Quick assessment
Affected
Nordic Semiconductor ASA nRF5340
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
任何在 nRF5340 上使用外部 QSPI 闪存进行加密 XIP（就地执行）并依赖该加密来保障外部存储代码的机密性和/或完整性的应用程序。问题的根本原因并非某个特定版本的 nRF Connect SDK，而在于其“即时解密”机制本身存在缺陷。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-18796
Vulnerability Information
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Vulnerability Title
QSPI flash encryption side-channel leakage
Source: CVE Program / CVE List V5
Vulnerability Description
Any application that
uses external QSPI flash for encrypted XIP on nRF5340 and relies on that
encryption for confidentiality and/or integrity of the externally stored
code. No specific nRF Connect SDK version is the root cause; the weakness
is in the on-the-fly decryption scheme.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1342
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Nordic Semiconductor ASA | nRF5340 | All build codes | - |
|
II. Public POCs for CVE-2026-18796
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-18796 (1)
Same Patch Batch · Nordic Semiconductor ASA · 2026-09-07 · 3 CVEs total
| CVE-2026-14297 | 8.7 HIGH | The Continuous Glucose Monitoring Service's Record Access Control Point (RACP) write handl |
| CVE-2026-14296 | 7.5 HIGH | nRF54H20: MCUBoot can be tricked to executing unauthenticated code |
IV. Related Vulnerabilities
V. Comments for CVE-2026-18796
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