CVE-2026-54499
Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-502 CWE-676 |
| Vendor | stanfordnlp |
| Product | stanza |
| Published | Jul 8, 2026 |
| Last Updated | Jul 9, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
stanfordnlp / stanza
< 1.12.2
References
github.com: https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c github.com: https://github.com/stanfordnlp/stanza/pull/1587 github.com: https://github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8b7ad4 github.com: https://github.com/stanfordnlp/stanza/releases/tag/v1.12.2