{"id":"CVE-2026-54499","aliases":["GHSA-v5jw-96jm-7h2c","PYSEC-2026-3075"],"url":"https://o3.security/vulnerability/CVE-2026-54499","summary":"Stanza: Remote Code Execution via Unsafe Pickle Deserialization in Model Loaders","details":"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.","published":"2026-07-08T22:23:02.664Z","modified":"2026-08-12T03:51:36.008104519Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00344,"percentile":0.27631,"asOf":"2026-08-21"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"stanza","fixedVersion":"1.12.2"}],"fix":{"url":"https://github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8b7ad4","label":"stanfordnlp/stanza@b745008"},"references":[{"type":"WEB","url":"https://github.com/stanfordnlp/stanza/releases/tag/v1.12.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54499.json"},{"type":"ADVISORY","url":"https://github.com/stanfordnlp/stanza/security/advisories/GHSA-v5jw-96jm-7h2c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54499"},{"type":"FIX","url":"https://github.com/stanfordnlp/stanza/commit/b745008c68c9e50ccb5acd537cb6f2453f8b7ad4"},{"type":"FIX","url":"https://github.com/stanfordnlp/stanza/pull/1587"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.008104519Z"}}