CVE-2026-74797: OpenTofu before 1.11.4 Denial of Service via malicious zip

Severity: low (CVSS 3.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-16 · updated 2026-10-08
Weakness: CWE-400

Description

OpenTofu versions before 1.11.4 contain a denial of service vulnerability in the tofu init command when processing maliciously-crafted .zip archives for provider or module packages. Attackers can cause excessive CPU usage by controlling .zip archive content served during dependency installation, degrading system performance and preventing timely completion of the init process.

Affected products

opentofu: before 1.11.4 — fixed in 1.11.4

How to fix

Upgrade to a fixed version: opentofu 1.11.4. Check the vendor advisory for mitigations.

References

https://github.com/opentofu/opentofu/security/advisories/GHSA-r92c-9c7f-3pj8
https://www.vulncheck.com/advisories/opentofu-before-denial-of-service-via-malicious-zip

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