CVE-2026-59974
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
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 passes downloaded archives to zipfile.ZipFile.extractall without validating member paths, allowing a malicious archive with parent-directory traversal entries to write outside the intended model directory and potentially enable code execution. This issue is fixed in version 1.14.0.
Risk Assessment
A malicious model archive could overwrite files writable by the Stanza process, including shell configuration, SSH authorization data, Python packages, or executable scripts, potentially leading to code execution.
Recommendation
Update the Stanza library to version 1.14.0 or later.
Other vulnerabilities in Stanza
See all- CVE-2026-115878High
In the Stanza Stanford NLP Python library, versions 1.14.0 through 1.15.0 allow loading an attacker-supplied lemmatizer checkpoint to execute arbitrary code because stanza/models/lemma/trainer.py stores pos_dict as gzip-compressed pickle bytes and Trainer.load passes the decompressed stream to unrestricted pickle.loads. The path is reachable during pipeline construction through a caller-influenced lemma_model_path before inference begins.
- CVE-2026-54499High
A vulnerability in the Stanza NLP library allows arbitrary code execution via a malicious .pt model file. The model loading mechanism first attempts safe torch.load with weights_only=True, but falls back to unsafe weights_only=False on an attacker-controlled pickle.UnpicklingError, enabling arbitrary code execution when the model is loaded.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS