# terraform v1.15.9

- Product: terraform (https://whatsnew.fyi/product/terraform)
- Vendor: terraform
- Date: 2026-08-19
- Version: v1.15.9
- Original notes: https://github.com/hashicorp/terraform/releases/tag/v1.15.9
- Permalink: https://whatsnew.fyi/product/terraform/releases/v1.15.9

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- **fixed** — Child module validation now raises errors or warning diagnostics for invalid blocks (list, import, backend, and cloud)
- **security** — Update go-slug to v0.18.3 to mitigate CVE-2026-14978, a Unicode normalization issue that could lead to files not being correctly excluded via .terraformignore from upload to Terraform Enterprise or HCP Terraform during a run

##### 1.15.9 (August 19, 2026)


BUG FIXES:

* validate: Child module validation has been fixed and will now raise errors or warning diagnostics for invalid blocks. (`list`, `import`, `backend`, and `cloud`) ([#38994](https://github.com/hashicorp/terraform/issues/38994))


NOTES:

* Update go-slug to v0.18.3 to mitigate CVE-2026-14978, which is a Unicode normalization issue that could lead to files not being correctly excluded via `.terraformignore` from upload to a Terraform Enterprise or HCP Terraform during a run ([#39036](https://github.com/hashicorp/terraform/issues/39036))