What’s Vulnerable › Vulnerabilities

CVE-2026-54499: Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-08 · updated 2026-10-25
• Weakness: CWE-502

Description

Stanza is a Stanford NLP Python library for tokenization, sentence segmentation, NER, and parsing of many human languages. Prior to 1.12.2, Stanza model loaders such as stanza.models.common.pretrain.Pretrain.load() attempt torch.load(..., weights_only=True) but fall back to torch.load(..., weights_only=False) on attacker-controllable pickle.UnpicklingError, allowing a malicious .pt pretrain or model file to execute arbitrary pickle code when a Stanza NLP pipeline loads it. This issue is fixed in version 1.12.2.

Affected products

• stanfordnlp stanza: before 1.12.2 — fixed in 1.12.2

How to fix

Upgrade to a fixed version: stanfordnlp stanza 1.12.2. Check the vendor advisory for mitigations.

References

• https://github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8b7ad4
• https://github.com/stanfordnlp/stanza/pull/1587
• https://github.com/stanfordnlp/stanza/releases/tag/v1.12.2
• https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c
• https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c

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