CVE-2026-74796 opentofu CVE debrief

Who should care

Defenders and administrators using OpenTofu should assess exposure and prioritize verification of OpenTofu versions and configurations, especially in environments where untrusted users have access to working directories.

Why it matters

CVE-2026-74796 is a high-severity vulnerability in OpenTofu that allows attackers to write to arbitrary filesystem locations. Defenders should prioritize verifying OpenTofu versions and configurations, especially in environments where untrusted users have access to working directories.

• Path traversal and arbitrary file write
• Potential for data tampering and unauthorized access
• Need for verification of OpenTofu versions and configurations
• Possible impact on system integrity and availability

Technical summary

OpenTofu before 1.11.7 fails to validate existing symlinks in the provider cache directory during initialization, allowing attackers to place malicious symlinks in trusted working directories and write provider package contents to arbitrary filesystem locations outside the working tree. This vulnerability has a CVSS score of 7 and is classified as HIGH severity. The vulnerability is caused by a lack of validation of symlinks in the provider cache directory, which allows attackers to write to arbitrary filesystem locations.

Defensive priority

Defenders should prioritize verifying OpenTofu versions and configurations, especially in environments where untrusted users have access to working directories.

Recommended defensive actions

• Verify OpenTofu version and upgrade to 1.11.7 or later
• Review and restrict access to working directories
• Monitor for suspicious symlink creation
• Perform a thorough review of system logs to detect potential exploitation attempts
• Implement compensating controls, such as restricting write access to sensitive directories
• Conduct a thorough asset inventory to identify potentially vulnerable systems
• Establish a rollback change window in case of issues with updates

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but do not specify affected or fixed versions beyond OpenTofu 1.11.7. The NVD entry is currently Awaiting Analysis. The vulnerability has a CVSS score of 7 and is classified as HIGH severity. There are no known exploits or reports of this vulnerability being used in attacks. However, defenders should verify OpenTofu versions and configurations to ensure they are not exposed. The CVE record was published on 2026-08-16T14:16:57.727Z and has not been modified since then.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.