CVE-2026-115878
Stanza: RCE via pickle deserialization in the lemmatizer
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.
Fixes and workarounds
Fix
stanza (PyPI): OSV reports a fixed version 1.15.0. Check the advisory for supported release branches.
Source: OSV GHSA-gh9r-c94j-cmp5Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| stanza stanfordnlp |
= 1.14.0 (affected) | CNA: GitHub_M |
stanzastanza
PyPI |
1.14.0 (affected, PyPI) Ecosystem version events: introduced 1.14.0; fixed 1.15.0 Source events (ECOSYSTEM)Other versions: unaffected |
OSV GHSA-gh9r-c94j-cmp5 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.8 high |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/stanfordnlp/stanza/security/advisories/GHSA-gh9r-c94j-cmp5CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/stanfordnlp/stanza/pull/1649CNA: GitHub_M · x_refsource_MISC
- https://github.com/stanfordnlp/stanza/commit/b21e1c9b47b4fccff21d3b0a6c0687a19410c2f0CNA: GitHub_M · x_refsource_MISC
- https://github.com/stanfordnlp/stanza/releases/tag/v1.15.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-gh9r-c94j-cmp5OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-gh9r-c94j-cmp5OSV / GitHub Security Advisories · osv
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