CVE-2026-26189

Summary

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.

Affected Software

VendorProductVersion RangeStatus
aquasecuritytrivy-action>= 0.31.0, < 0.34.0affected

Weaknesses

  • CWE-78: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References