CVE-2022-35954: GitHub Toolkit

Medium severity, CVSS 5.0. EPSS: 0.7% chance of exploitation in the next 30 days.

The GitHub Actions ToolKit provides a set of packages to make creating actions easier. The `core.exportVariable` function uses a well known delimiter that attackers can use to break out of that specific variable and assign values to other arbitrary variables. Workflows that write untrusted values to the `GITHUB_ENV` file may cause the path or other environment variables to be modified without the intention of the workflow or action author. Users should upgrade to `@actions/core v1.9.1`. If you are unable to upgrade the `@actions/core` package, you can modify your action to ensure that any user input does not contain the delimiter `_GitHubActionsFileCommandDelimeter_` before calling `core.exportVariable`.

Affected products

• GitHub Toolkit: before 1.9.1 (fixed in 1.9.1)

Published 2022-08-15. Last modified 2026-06-17.