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Vulnerability record · CVE-2026-54499 · published 8 July 2026

CVE-2026-54499: Stanford stanza deserialization of untrusted data vulnerability

Stanford · Stanza

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.

7.5 CVSS 3.1 High EPSS 0.52% · top 58.2% CWE-502 · Deserialization of untrusted dataCWE-676 · CWE-676
7.5CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
13 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8b7ad4 Patch
https://github.com/stanfordnlp/stanza/pull/1587 Issue TrackingPatch
https://github.com/stanfordnlp/stanza/releases/tag/v1.12.2 Release Notes
https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c ExploitVendor Advisory
https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-54499), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.