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

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Summary

CVECVE-2026-54499
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 23:16:54 UTC
Updated2026-07-13 14:57:10 UTC
DescriptionStanza 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003020000 probability, percentile 0.220600000 (date 2026-07-13)

Problem Types: CWE-502 | CWE-676 | CWE-502 CWE-502: Deserialization of Untrusted Data | CWE-676 CWE-676: Use of Potentially Dangerous Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Stanford Stanza All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Stanfordnlp Stanza affected < 1.12.2 Not specified

References

ReferenceSourceLinkTags
github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8... [email protected] github.com Patch
github.com/stanfordnlp/stanza/pull/1587 [email protected] github.com Issue Tracking, Patch
github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
github.com/stanfordnlp/stanza/releases/tag/v1.12.2 [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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