CVE-2026-26189 Trivy Action has a script injection via sourced env file in composite action
Attackers can execute arbitrary commands in GitHub Actions runners by injecting shell metacharacters into Trivy Action inputs.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26189?
CVE-2026-26189 is a medium-severity command injection vulnerability in aquasecurity trivy-action, published on 19 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Trivy Action runs Trivy as GitHub action to scan a Docker container image for vulnerabilities. A command injection vulnerability exists in `aquasecurity/trivy-action` versions 0.31.0 through 0.33.1 due to improper handling of action inputs when exporting environment variables. The action writes `export VAR=<input>` lines to `trivy_envs.txt` based on user-supplied inputs and subsequently sources this file in `entrypoint.sh`. Because input values are written without appropriate shell escaping, attacker-controlled input containing shell metacharacters (e.g., `$(...)`, backticks, or other command substitution syntax) may be evaluated during the sourcing process. This can result in arbitrary command execution within the GitHub Actions runner context. Version 0.34.0 contains a patch for this issue. The vulnerability is exploitable when a consuming workflow passes attacker-controlled data into any action input that is written to `trivy_envs.txt`. Access to user input is required by the malicious actor. Workflows that do not pass attacker-controlled data into `trivy-action` inputs, workflows that upgrade to a patched version that properly escapes shell values or eliminates the `source ./trivy_envs.txt` pattern, and workflows where user input is not accessible are not affected.
Weakness: CWE-78
Which versions are affected by CVE-2026-26189?
1 open source package ship an affected version, including aquasecurity/trivy-action. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
aquasecurity/trivy-action GitHub Actions | From 0.31.0 | 0.34.0 |
Products include Aquasec Trivy Action.
How do I fix CVE-2026-26189?
Upgrade aquasecurity/trivy-action to 0.34.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-26189 being exploited?
There is no known exploitation of CVE-2026-26189 in the wild and no public exploit code.
Sources
Also known as GHSA-9p44-j4g5-cfx5.