CVE-2026-63310

MEDIUMCVSS 6.5/10EPSS 0.11%

Last modified

CVE-2026-63310 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 0.11% chance of exploitation in the next 30 days.

Description

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.

Metrics

Weakness Enumeration

Affected Software

VendorProductVersions
NltkNltk< 3.9.3

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-63310?
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.
How severe is CVE-2026-63310?
CVE-2026-63310 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63310?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST