Is CVE-2026-42627 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-42627 being exploited in the wild.

How severe is CVE-2026-42627?

Medium severity, with a CVSS score of 6.2, published 22 May 2026.

Is there a fix for CVE-2026-42627?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-42627 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-42627?

Check whether you run ArmNN at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-42627: Arm ArmNN integer overflow in TensorShape::GetNumElements

CVE-2026-42627 · Severity: medium · CVSS 6.2 · Published 2026-05-22

ArmNN is a software library used to accelerate machine learning on ARM-based devices. A vulnerability in how it processes certain model files could allow an attacker to crash an application or cause it to behave unexpectedly by providing a specially crafted TFLite model. This could impact the reliability and availability of services relying on machine learning inference.

Vendors: Arm.

Quick answers

Is CVE-2026-42627 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-42627 being exploited in the wild.
How severe is CVE-2026-42627?: Medium severity, with a CVSS score of 6.2, published 22 May 2026.
Which products and versions are affected?: ArmNN through 2026-03-27.
Is there a fix for CVE-2026-42627?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-42627 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-42627?: Check whether you run ArmNN at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow vulnerability exists in TensorShape::GetNumElements() within armnn/Tensor.cpp. The flaw occurs when multiplying tensor dimensions using 32-bit unsigned arithmetic without sufficient overflow detection. This causes GetNumBytes() to return an understated allocation size, leading to a heap-based buffer over-read during the model optimization phase, specifically within the BatchToSpaceNdLayer during the Optimize()->InferOutputShapes() call. An attacker can exploit this by providing a malicious TFLite model file. The vulnerability is triggered locally and can lead to a denial of service (application crash).

Affected products

Arm ArmNN through 2026-03-27

Timeline

2026-05-22: disclosed
2026-05-22: advisory

References

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