{"id":"CVE-2026-26189","aliases":["GHSA-9p44-j4g5-cfx5"],"url":"https://o3.security/vulnerability/CVE-2026-26189","summary":"Trivy Action has a script injection via sourced env file in composite action","details":"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.","published":"2026-02-19T19:07:49.631Z","modified":"2026-07-15T01:49:15.048700564Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"GitHub Actions","name":"aquasecurity/trivy-action","fixedVersion":"0.34.0"}],"fix":{"url":"https://github.com/aquasecurity/trivy-action/commit/7aca5acc9500b463826cc47a47a65ad7d404b045","label":"aquasecurity/trivy-action@7aca5ac"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26189.json"},{"type":"ADVISORY","url":"https://github.com/aquasecurity/trivy-action/security/advisories/GHSA-9p44-j4g5-cfx5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26189"},{"type":"FIX","url":"https://github.com/aquasecurity/trivy-action/commit/7aca5acc9500b463826cc47a47a65ad7d404b045"},{"type":"FIX","url":"https://github.com/aquasecurity/trivy-action/commit/bc61dc55704e2d5704760f3cdab0d09acf16e4ca"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:15.048700564Z"}}