VULNRABLE / Vulnerability / CVE-2026-63311

CVE-2026-63311

MEDIUM LOW nltk GHSA

Exploit verdict: No active-exploit signal

CVSS Score

5.5

Severity

MEDIUM

EPSS

Source

GHSA

Summary

NLTK: SSRF Fail-Open in validate_network_url() via DNS Resolution Failure

What this means

CVE-2026-63311 is a medium-severity vulnerability affecting nltk, rated CVSS 5.5. The EPSS model estimates a 0% probability of exploitation in the next 30 days. Published September 2, 2026.

View full advisory at GHSA →