PT-2026-20564 · Github Actions · Aquasecurity/Trivy-Action

Published

2026-02-18

·

Updated

2026-02-18

CVSS v3.1

5.9

Medium

VectorAV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
Command Injection in aquasecurity/trivy-action via Unsanitized Environment Variable Export
A command injection vulnerability exists in aquasecurity/trivy-action 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., $(...), backticks, or other command substitution syntax) may be evaluated during the sourcing process. This can result in arbitrary command execution within the GitHub Actions runner context.
Severity:
Moderate
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE-78: Improper Neutralization of Special Elements used in an OS Command (‘OS Command Injection’)
Impact:
Successful exploitation may lead to arbitrary command execution in the CI runner environment.
Affected Versions:
  • Versions >= 0.31.0 and <= 0.33.1
  • Introduced in commit 7aca5ac
Affected Conditions:
The vulnerability is exploitable when a consuming workflow passes attacker-controlled data into any action input that is written to trivy envs.txt. Access to user input is required by the malicious actor.
A representative exploitation pattern involves incorporating untrusted pull request metadata into an action parameter. For example:
- uses: aquasecurity/trivy-action@0.33.1
 with:
  output: "trivy-${{ github.event.pull request.title }}.sarif"
If the pull request title contains shell syntax, it may be executed when the generated environment file is sourced.
Not Affected:
  • 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
  • Workflows where user input is not accessible.
Call Sites:
  • action.yaml:188 — set env var if provided writes unescaped export lines
  • entrypoint.sh:9 — sources ./trivy envs.txt

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

GHSA-9P44-J4G5-CFX5

Affected Products

Aquasecurity/Trivy-Action