Copier has a trust-prefix bypass via path traversal that runs tasks unprompted
High-risk advisory
CVE-2026-53951
Summary
Copier has a trust-prefix bypass via path traversal that runs tasks unprompted
Why it matters
GitHub has published a reviewed security advisory for copier. Prioritize it with other application dependency updates, especially because EPSS places it in the 9% percentile.
Operator check
Check whether copier is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 8.8. EPSS probability: 0.2%; percentile: 9%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.