MEDIUMUnknown →
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
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.
Affected packages
- nltk
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://www.cve.org/CVERecord?id=CVE-2026-63310
- https://github.com/nltk/nltk/security/advisories/ghsa-5wp5-5229-5g6q
- https://security-tracker.debian.org/tracker/cve-2026-63310
- https://github.com/cveproject/cvelistv5/tree/main/cves/2026/63xxx/cve-2026-63310.json
- https://nvd.nist.gov/vuln/detail/cve-2026-63310
- https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification
Structured record: https://ubuntu.com/security/CVE-2026-63310
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
Some links are affiliate links — HackTribune may earn a commission at no extra cost to you.
Get incidents like this as alerts for your stack.
Join the beta