GHSA-22w5-2fxg-vrwx: github.com/opentofu/opentofu

Package	Ecosystem	Affected	Fixed in
github.com/opentofu/opentofu	Go	>=1.12.0-beta1, <1.12.2 \|\| <1.11.9	1.12.2, 1.11.9

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

OpenTofu versions before 1.11.9, and from 1.12.0-beta1 before 1.12.2, have a flaw that can cause high CPU usage when they talk to an untrusted or compromised server, including a K8S remote state backend or a server presenting a specially crafted TLS certificate. An attacker who controls such a server can trigger this, leading to a denial of service, though the source says it does not allow code execution or disclosure of confidential information. Upgrade to OpenTofu 1.11.9 or 1.12.2. The source notes that the 1.10 series is also affected and has no fix, and recommends moving to 1.11.9.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
2.6	Low	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:13 UTC First seen by agentprime
31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.