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CVE-2026-54499— Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders

Quick assessment

Affected
stanfordnlp stanza
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Stanford NLP Stanza是美国Stanford NLP大学的一个自然语言处理工具包。 Stanford NLP stanza 1.12.2之前版本存在安全漏洞，该漏洞源于模型加载器在 torch.load 中尝试使用 weights_only=True 失败后回退到 weights_only=False，可能允许恶意 .pt 模型文件在加载时执行任意pickle代码。

CVSS 7.5 · High EPSS 0.52% · P44

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
stanfordnlp stanza < 1.12.2 affected
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I. Basic Information for CVE-2026-54499

Vulnerability Information
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Vulnerability Title
Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Stanford NLP stanza 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Stanford NLP Stanza是美国Stanford NLP大学的一个自然语言处理工具包。 Stanford NLP stanza 1.12.2之前版本存在安全漏洞，该漏洞源于模型加载器在 torch.load 中尝试使用 weights_only=True 失败后回退到 weights_only=False，可能允许恶意 .pt 模型文件在加载时执行任意pickle代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
stanfordnlp stanza < 1.12.2 -

II. Public POCs for CVE-2026-54499

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9375 chars
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III. Intelligence Information for CVE-2026-54499

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Patches & Fixes for CVE-2026-54499 (1)

Vendor Advisories for CVE-2026-54499 (1)

Vendor Pages for CVE-2026-54499 (1)

IV. Related Vulnerabilities

Same product: stanza
Same vendor: stanfordnlp
Same weakness: CWE-502