CVE-2026-18796 Nordic Semiconductor ASA CVE debrief

Who should care

Defenders and developers responsible for nRF5340 device configurations, secure coding practices, and external QSPI flash interactions should assess exposure and prioritize verification.

Why it matters

Defenders should assess exposure and prioritize verification of decryption scheme usage and external QSPI flash reliance in nRF5340 devices, as the vulnerability may impact confidentiality and integrity of externally stored code.

• Potential confidentiality impacts on externally stored code.
• Potential integrity impacts on externally stored code.
• Verification priority for decryption scheme usage and external QSPI flash reliance.

Technical summary

The vulnerability affects applications using external QSPI flash for encrypted XIP on nRF5340 devices, potentially impacting confidentiality and integrity of externally stored code. The issue arises from the specific implementation of the on-the-fly decryption scheme. This weakness is not specific to any nRF Connect SDK version but is inherent in the decryption scheme itself. The vulnerability may allow confidentiality and/or integrity impacts on externally stored code under certain conditions. Defenders should assess exposure and prioritize verification of decryption scheme usage and external QSPI flash reliance in nRF5340 devices.

Defensive priority

Defenders should assess exposure and prioritize verification of decryption scheme usage and external QSPI flash reliance in nRF5340 devices.

Recommended defensive actions

• Assess nRF5340 device configurations for external QSPI flash usage and encrypted XIP reliance.
• Verify decryption scheme usage and potential impacts on confidentiality and integrity.
• Review and update secure coding practices for external QSPI flash interactions.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE description indicates that the weakness is in the on-the-fly decryption scheme used for encrypted XIP on nRF5340 devices that rely on external QSPI flash. The vulnerability may impact confidentiality and/or integrity of externally stored code. The issue is not related to a specific nRF Connect SDK version but is a result of the decryption scheme's implementation. Defenders should verify the usage of this scheme and its potential impacts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.