Arm ArmNN up to 2026-03-27 TFLite armnn/Tensor.cpp GetNumElements integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in Arm ArmNN up to 2026-03-27. This affects the function TensorShape::GetNumElements of the file armnn/Tensor.cpp of the component TFLite Handler. This manipulation causes integer overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is tracked as CVE-2026-42627. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in Arm ArmNN up to 2026-03-27. Affected by this vulnerability is the function TensorShape::GetNumElements of the file armnn/Tensor.cpp of the component TFLite Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In Arm ArmNN through 2026-03-27, an integer overflow in TensorShape::GetNumElements() in armnn/Tensor.cpp allows a crafted TFLite model file to bypass buffer size validation and trigger a heap-based buffer over-read during model optimization. The overflow occurs when multiplying tensor dimensions using 32-bit unsigned arithmetic without overflow detection, causing GetNumBytes() to return an understated allocation size. During Optimize()->InferOutputShapes(), the BatchToSpaceNdLayer reads beyond the allocated buffer.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-42627 since 04/29/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/26/2026).

The vulnerability scanner Nessus provides a plugin with the ID 316557 (Linux Distros Unpatched Vulnerability : CVE-2026-42627), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (316557). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Arm

Name

• ArmNN

Version

• 2026-03-27

License

• commercial

Support

• end of life

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion