{"id":"CVE-2026-79657","revision":"7426279358454f4585dbf2bceac00347","records":[{"revision":"7426279358454f4585dbf2bceac00347","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-79657","aliases":[],"title":"NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization","description":"NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer._execute and numpy.f2py.crackfortran.myeval through pickle REDUCE to execute arbitrary commands during model or tokenizer artifact loading.","state":0,"publishedAt":"2026-08-25T11:33:22.645+00:00","modifiedAt":"2026-10-08T15:25:11.08+00:00","affected":[{"ecosystem":"Vendor product","name":"nltk","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nltk\",\n                    \"product\": \"nltk\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.10.3\"\n                        },\n                        {\n                            \"version\": \"3.10.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:pypi/nltk\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/nltk/nltk/security/advisories/GHSA-x99w-6fgc-pmfw","https://www.vulncheck.com/advisories/nltk-before-3.10.3-remote-code-execution-via-unsafe-pickle-deserialization"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-79657","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-79657","identifiers":["CVE-2026-79657"]},"retained":false,"historicalAffected":[]}],"coverage":[]}