CVE-2026-54499

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductStanford Stanza

PublishedJul 8, 2026

First seenJul 8, 2026

Weakness typeCWE-502Deserialization of untrusted data CWE-676CWE-676

How to fix

Update

stanford stanza1.12.2 or later
stanza1.12.2 or later

Affected products

Product	Affected versions	Fixed in
stanford stanza	v < 1.12.2	1.12.2
stanzaPyPI	v < 1.12.2	1.12.2

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