Stanford NLP Stanza up to 1.13.x Unzip common.py stanza.resources.common.unzip path traversal

Summaryinfo

A vulnerability was found in Stanford NLP Stanza up to 1.13.x and classified as critical. This affects the function stanza.resources.common.unzip of the file stanza/resources/common.py of the component Unzip. Executing a manipulation can lead to path traversal. This vulnerability appears as CVE-2026-59974. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Stanford NLP Stanza up to 1.13.x. This vulnerability affects the function stanza.resources.common.unzip of the file stanza/resources/common.py of the component Unzip. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Stanza is a Stanford NLP Python library for tokenization, sentence segmentation, NER, and parsing of many human languages. Prior to 1.14.0, stanza.resources.common.unzip in stanza/resources/common.py passes downloaded model and resource archives to zipfile.ZipFile.extractall without validating member paths, and the vulnerable extraction path is reachable through stanza.download and stanza.install_corenlp. A malicious archive containing parent-directory traversal entries can write outside the intended model directory, allowing files writable by the Stanza process to be overwritten and potentially enabling code execution through modified shell configuration, SSH authorization data, Python packages, or executable scripts. This issue is fixed in version 1.14.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-59974 since 07/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 1.14.0 eliminates this vulnerability.

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Productinfo

Vendor

• Stanford NLP

Name

• Stanza

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13

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CPE 2.2info

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