Gruntwork-io Terragrunt up to 1.0.3 Cleanup internal/util/file.go fileManifest.Clean path traversal

Summaryinfo

A vulnerability was found in Gruntwork-io Terragrunt up to 1.0.3. It has been declared as critical. This affects the function fileManifest.Clean of the file internal/util/file.go of the component Cleanup. Executing a manipulation can lead to path traversal. The identification of this vulnerability is CVE-2026-45099. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Gruntwork-io Terragrunt up to 1.0.3 and classified as critical. This vulnerability affects the function fileManifest.Clean of the file internal/util/file.go of the component Cleanup. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect integrity, and availability. CVE summarizes:

Terragrunt is a flexible orchestration tool that allows Infrastructure as Code written in OpenTofu or Terraform to scale. Prior to 1.0.4, Terragrunt trusts paths decoded from a downloaded module's .terragrunt-module-manifest during fileManifest.Clean() in internal/util/file.go. A malicious or compromised external module can place absolute or traversal paths in the manifest, causing cleanup to delete files outside the module cache that are accessible to the Terragrunt process before OpenTofu or Terraform executes. This deletion-only primitive can remove local source code or configuration and disrupt CI/CD pipelines. This issue is fixed in version 1.0.4.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-45099 since 05/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 1.0.4 eliminates this vulnerability.

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Productinfo

Vendor

• Gruntwork-io

Name

• Terragrunt

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

Website

• Product: https://github.com/gruntwork-io/terragrunt/

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