CVE-2026-115878
HIGH 1 PoC
MEDIUM
Priority: 0.05
BB Relevance:
51/100
Published: 2026-11-03
Modified: 2026-11-12
First seen: 2026-11-03
Status: active
Attack Surface
Low Complexity
No Auth
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
Required
S:
Unchanged
C:
High
I:
High
A:
High
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.
Weakness Classification (2)
Affected Software (2)
| Vendor | Product | Version |
|---|---|---|
| stanfordnlp | stanza | = 1.14.0 |
| stanfordnlp | stanza | = 1.14.0 |
References & Advisories (4)
x_refsource_MISC
x_refsource_MISC
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x_refsource_CONFIRM