CVE-2026-25761 Command injection via crafted filenames in Super-linter Action
Attackers can execute arbitrary commands in GitHub Actions runners via crafted filenames, potentially exposing secrets like GITHUB_TOKEN.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-25761?
CVE-2026-25761 is a high-severity command injection vulnerability in super-linter, published on 9 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Super-linter is a combination of multiple linters to run as a GitHub Action or standalone. From 6.0.0 to 8.3.0, the Super-linter GitHub Action is vulnerable to command injection via crafted filenames. When this action is used in downstream GitHub Actions workflows, an attacker can submit a pull request that introduces a file whose name contains shell command substitution syntax, such as $(...). In affected Super-linter versions, runtime scripts may execute the embedded command during file discovery processing, enabling arbitrary command execution in the workflow runner context. This can be used to disclose the job’s GITHUB_TOKEN depending on how the workflow configures permissions. This vulnerability is fixed in 8.3.1.
Weakness: CWE-77
Which versions are affected by CVE-2026-25761?
2 open source packages ship an affected version, including super-linter/super-linter and super-linter/super-linter/slim. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
super-linter/super-linter GitHub Actions | From 6.0.0 | 8.3.1 |
super-linter/super-linter/slim GitHub Actions | From 6.0.0 | 8.3.1 |
Products include Super-Linter Project Super-Linter.
How do I fix CVE-2026-25761?
Upgrade super-linter/super-linter to 8.3.1 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-25761 being exploited?
There is no known exploitation of CVE-2026-25761 in the wild and no public exploit code.
Sources
Also known as GHSA-r79c-pqj3-577x.