copier up to 9.11.1 _preserve_symlinks

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in copier up to 9.11.1. This affects the function _preserve_symlinks. Executing a manipulation can lead to symlink. This vulnerability is handled as CVE-2026-23968. It is possible to launch the attack on the local host. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in copier up to 9.11.1 and classified as problematic. This vulnerability affects the function _preserve_symlinks. The manipulation with an unknown input leads to a symlink vulnerability. The CWE definition for the vulnerability is CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. As an impact it is known to affect confidentiality. CVE summarizes:

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 include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-23968 since 01/19/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 9.11.2 eliminates this vulnerability. Applying the patch b3a7b3772d17cf0e7a4481978188c9f536c8d8f6 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Symlink
CWE: CWE-61 / CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: copier 9.11.2
Patch: b3a7b3772d17cf0e7a4481978188c9f536c8d8f6

Timelineinfo

01/19/2026 CVE reserved
01/21/2026 +2 days VulDB entry created
01/22/2026 +0 days Advisory disclosed
02/03/2026 +12 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-xjhm-gp88-8pfx
Status: Confirmed

CVE: CVE-2026-23968 (🔒)
GCVE (CVE): GCVE-0-2026-23968
GCVE (VulDB): GCVE-100-342256

Entryinfo

Created: 01/22/2026 00:56
Updated: 02/03/2026 06:12
Changes: 01/22/2026 00:56 (69), 02/03/2026 06:12 (11)
Complete: 🔍
Cache ID: 216::103

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