UNIX Symbolic Link (Symlink) Following Affecting copier package, versions [,9.11.2)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-COPIER-15054509
- published22 Jan 2026
- disclosed21 Jan 2026
- creditUnknown
Introduced: 21 Jan 2026
CVE-2026-23986 (opens in a new tab)How to fix?
Upgrade copier to version 9.11.2 or higher.
Overview
copier is an A library for rendering project templates.
Affected versions of this package are vulnerable to UNIX Symbolic Link (Symlink) Following via the symlink resolution process in safe templates when _preserve_symlinks is set to true. An attacker can overwrite arbitrary files on the filesystem, within the user's write permissions, by crafting a malicious template that uses the generated directory structure functionality.