{"id":"CVE-2026-63310","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-63310","summary":"NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning…","details":"NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation.","published":"2026-08-22T15:16:19.100","modified":"2026-08-22T15:16:19.100","cvss":{"score":7.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-22T15:16:19.100"}}