CVE-2026-54499: Stanford Stanza

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• Stanford Stanza: before 1.12.2 (fixed in 1.12.2)

Published 2026-07-08. Last modified 2026-07-13.