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CVE-2026-115878— Stanza: RCE via pickle deserialization in the lemmatizer

Quick assessment

Affected
stanfordnlp stanza
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Stanza 是斯坦福 NLP 提供的 Python 库，支持多种人类语言的词元化（tokenization）、句子切分、命名实体识别（NER）及句法解析。在 1.14.0 至 1.15.0 版本中，若加载由攻击者提供的词形还原器（lemmatizer）检查点，可能导致任意代码执行。其根本原因在于： 将 以 gzip 压缩的 pickle 字节形式存储，而 方法在解压后直接将该数据流传递给无限制的 函数。虽然外层的 调用了 ，但嵌套的字节数据被视为原始类型，因此未受到该白名单机制的检查。该攻击路径在推理开始前，通过

CVSS 7.8 · High
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I. Basic Information for CVE-2026-115878

Vulnerability Information
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Vulnerability Title
Stanza: RCE via pickle deserialization in the lemmatizer
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. From 1.14.0 until 1.15.0, loading an attacker-supplied lemmatizer checkpoint can execute arbitrary code because stanza/models/lemma/trainer.py stores pos_dict as gzip-compressed pickle bytes and Trainer.load passes the decompressed stream to unrestricted pickle.loads. The outer torch.load call uses weights_only=True, but the nested bytes are treated as a primitive and are not inspected by that allowlist. The path is reachable during pipeline construction through a caller-influenced lemma_model_path, before inference begins. This issue is fixed in version 1.15.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
stanfordnlp stanza = 1.14.0 -

II. Public POCs for CVE-2026-115878

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III. Intelligence Information for CVE-2026-115878

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Other References for CVE-2026-115878 (4)

IV. Related Vulnerabilities

Same product: stanza
Same vendor: stanfordnlp
Same weakness: CWE-94