Vulnerability-Lookup

CVE-2026-45099 (GCVE-0-2026-45099)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:07 – Updated: 2026-08-25 14:23

Title

Terragrunt: Arbitrary File Deletion via Malicious Module Manifest

Summary

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.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 14:23 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/gruntwork-io/terragrunt/securi…	x_refsource_CONFIRM
https://github.com/gruntwork-io/terragrunt/pull/6032	x_refsource_MISC
https://github.com/gruntwork-io/terragrunt/commit…	x_refsource_MISC
https://github.com/gruntwork-io/terragrunt/releas…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gruntwork-io	terragrunt	Affected: < 1.0.4	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-45099

Vulnerability from fkie_nvd - Published: 2026-08-21 21:16 - Updated: 2026-08-25 15:16

Severity

6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/gruntwork-io/terragrunt/commit/3d6f10d6bccc851c6506a307a0b8675e0346e65e
	security-advisories@github.com	https://github.com/gruntwork-io/terragrunt/pull/6032
	security-advisories@github.com	https://github.com/gruntwork-io/terragrunt/releases/tag/v1.0.4
	security-advisories@github.com	https://github.com/gruntwork-io/terragrunt/security/advisories/GHSA-8394-6f8r-whxg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "terragrunt",
          "vendor": "gruntwork-io",
          "versions": [
            {
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    }
  ],
  "id": "CVE-2026-45099",
  "lastModified": "2026-08-25T15:16:32.377",
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedAttackComplexity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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}

GHSA-8394-6F8R-WHXG

Vulnerability from github – Published: 2026-08-17 16:37 – Updated: 2026-08-17 16:37

Summary

Terragrunt: Arbitrary File Deletion via Malicious Module Manifest

Details

Summary

Terragrunt is vulnerable to an arbitrary file deletion flaw when downloading external modules. If a remote module contains a maliciously crafted .terragrunt-module-manifest file, Terragrunt can be tricked into deleting files anywhere on the local filesystem that the Terragrunt process has access to.

Impact

This vulnerability impacts users who download and run untrusted or compromised OpenTofu/Terraform modules. The file deletion occurs during the module download and initialization phase, meaning it happens before OpenTofu or Terraform executes.

In a CI/CD environment or automated runner, an attacker-controlled module could delete arbitrary files, causing denial of service in the deployment pipeline. In a local environment, it could lead to the loss of local source code or configuration files.

This vulnerability is a deletion-only primitive; it does not directly allow for arbitrary code execution (RCE) or data exfiltration.

Affected Versions

Terragrunt < v1.0.4

Patches

This vulnerability has been resolved in Terragrunt version v1.0.4.

All users are strongly advised to upgrade.

Workarounds

If users cannot upgrade immediately, they can mitigate this risk by:

Strictly auditing the source URLs of all remote modules used in their Terragrunt configurations.
Only consuming modules from trusted, internally vetted sources or verified registries.
Pinning module versions to specific, known-safe Git commit SHAs rather than mutable tags or branches.

Technical Details

Terragrunt tracks files copied into a downloaded module's working directory using a .terragrunt-module-manifest file. During the directory cleanup process, Terragrunt decodes the entries in this manifest and removes the listed files to prepare a fresh directory for OpenTofu/Terraform runs.

Previously, Terragrunt trusted the manifest provided by the downloaded module without verifying that the paths scheduled for deletion remained within the boundaries of the module's destination directory. An attacker could forge a manifest containing directory traversal paths, causing the cleanup function to target files outside the cache. The patch introduces a secure boundary check to ensure all cleaned paths remain safely isolated inside the intended manifest folder.

Credit

Terragrunt would like to thank Francesco Sabiu (@fsabiu) for discovering and responsibly disclosing this vulnerability.

Severity

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gruntwork-io/terragrunt"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45099"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-17T16:37:34Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nTerragrunt is vulnerable to an arbitrary file deletion flaw when downloading external modules. If a remote module contains a maliciously crafted `.terragrunt-module-manifest` file, Terragrunt can be tricked into deleting files anywhere on the local filesystem that the Terragrunt process has access to.\n\n### Impact\n\nThis vulnerability impacts users who download and run untrusted or compromised OpenTofu/Terraform modules. The file deletion occurs during the module download and initialization phase, meaning it happens before OpenTofu or Terraform executes.\n\nIn a CI/CD environment or automated runner, an attacker-controlled module could delete arbitrary files, causing denial of service in the deployment pipeline. In a local environment, it could lead to the loss of local source code or configuration files.\n\nThis vulnerability is a deletion-only primitive; it does not directly allow for arbitrary code execution (RCE) or data exfiltration.\n\n### Affected Versions\n\n- Terragrunt \u003c `v1.0.4`\n\n### Patches\n\nThis vulnerability has been resolved in Terragrunt version `v1.0.4`. \n\nAll users are strongly advised to upgrade.\n\n### Workarounds\n\nIf users cannot upgrade immediately, they can mitigate this risk by:\n\n1. Strictly auditing the source URLs of all remote modules used in their Terragrunt configurations.\n2. Only consuming modules from trusted, internally vetted sources or verified registries.\n3. Pinning module versions to specific, known-safe Git commit SHAs rather than mutable tags or branches.\n\n### Technical Details\n\nTerragrunt tracks files copied into a downloaded module\u0027s working directory using a `.terragrunt-module-manifest` file. During the directory cleanup process, Terragrunt decodes the entries in this manifest and removes the listed files to prepare a fresh directory for OpenTofu/Terraform runs.\n\nPreviously, Terragrunt trusted the manifest provided by the downloaded module without verifying that the paths scheduled for deletion remained within the boundaries of the module\u0027s destination directory. An attacker could forge a manifest containing directory traversal paths, causing the cleanup function to target files outside the cache. The patch introduces a secure boundary check to ensure all cleaned paths remain safely isolated inside the intended manifest folder.\n\n## Credit\n\nTerragrunt would like to thank Francesco Sabiu ([@fsabiu](https://github.com/fsabiu)) for discovering and responsibly disclosing this vulnerability.",
  "id": "GHSA-8394-6f8r-whxg",
  "modified": "2026-08-17T16:37:34Z",
  "published": "2026-08-17T16:37:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gruntwork-io/terragrunt/security/advisories/GHSA-8394-6f8r-whxg"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gruntwork-io/terragrunt"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gruntwork-io/terragrunt/releases/tag/v1.0.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Terragrunt: Arbitrary File Deletion via Malicious Module Manifest"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-45099 (GCVE-0-2026-45099)

FKIE_CVE-2026-45099

GHSA-8394-6F8R-WHXG

Summary

Impact

Affected Versions

Patches

Workarounds

Technical Details

Credit

Tags

Sightings

Nomenclature