CVE-2026-54499

Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders

State: Published
Severity: 7.5 High
Published: Jul 8, 2026
Updated: Jul 9, 2026
Reserved: Jun 15, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-502 Deserialization of Untrusted Data
CWE-676 Use of Potentially Dangerous Function

Affected Products

Product	Versions
stanzastanfordnlp	< 1.12.2Affected

References

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