{"id":"CVE-2026-115878","published":"2026-11-03T21:17:02.377","lastModified":"2026-11-03T23:17:30.297","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.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-94","CWE-502"],"vendors":[],"products":[],"references":[{"url":"https://github.com/stanfordnlp/stanza/commit/b21e1c9b47b4fccff21d3b0a6c0687a19410c2f0","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/pull/1649","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/releases/tag/v1.15.0","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/security/advisories/GHSA-gh9r-c94j-cmp5","tags":[]}],"exploitRefs":[{"url":"https://github.com/stanfordnlp/stanza/commit/b21e1c9b47b4fccff21d3b0a6c0687a19410c2f0","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/pull/1649","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/releases/tag/v1.15.0","tags":[]},{"url":"https://github.com/stanfordnlp/stanza/security/advisories/GHSA-gh9r-c94j-cmp5","tags":[]}],"hasPoc":true,"ai":null}