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CVE-2026-23986

Copier-org Copier vulnerability

7.1 HIGHPublic exploitEPSS 0.26%
  1. Published21 Jan 2026

Description

Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently write to arbitrary directories outside the destination path by using directory a symlink along with `_preserve_symlinks: true` and a generated directory structure whose rendered path is inside the symlinked directory. This way, a malicious template author can create a template that overwrites arbitrary files (according to the user's write permissions), e.g., to cause havoc. Version 9.11.2 patches the issue.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Affected products

Copier-org Copier< 9.11.2

Remediation

Fixed in
Copier-org Copier≥ 9.11.2

References

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Frequently asked

Is CVE-2026-23986 being actively exploited?

CVE-2026-23986 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.26%.

How severe is CVE-2026-23986?

CVE-2026-23986 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.26% probability of exploitation.

Which products are affected by CVE-2026-23986?

Affected products include Copier-org Copier.

How do I fix CVE-2026-23986?

Upgrade affected software to a fixed version, for example Copier-org Copier 9.11.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.