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CVE-2026-63310

7.1 · HIGH

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module.

Published Aug 22, 2026CWE-494

Overview

CVE-2026-63310 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6qRefwww.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63310?

CVE-2026-63310 is a high-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-63310?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63310?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-63310?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63310 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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