CVE-2026-18796

QSPI flash encryption side-channel leakage

State: Published
Severity: 6.8 Medium
Published: Sep 7, 2026
Updated: Sep 10, 2026
Reserved: Aug 4, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.8 Medium	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	YesWeHack

Weaknesses

CWE-1342 Information exposure through microarchitectural state after transient execution

Affected Products

Product	Versions
nRF5340Nordic Semiconductor ASA	All build codesAffected

References

https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html

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