CVE-2026-54293 nltk CVE debrief

Who should care

Developers and users of the NLTK library should be aware of this vulnerability and take steps to mitigate it. This includes updating to version 3.10.0-rc1 or later, and being cautious when loading data from untrusted sources. Organizations using NLTK in their applications should prioritize patching this vulnerability to prevent potential attacks.

Technical summary

The NLTK library is vulnerable to a path traversal attack via the nltk.data.load() function. The vulnerability exists due to an unsafe-path regex check being performed before URL-encoded path separators and traversal segments are decoded. This allows an attacker to bypass security protections and read arbitrary files from the filesystem. The vulnerability is fixed in version 3.10.0-rc1. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Defensive priority

High priority should be given to patching this vulnerability, as it has a high CVSS score and could allow an attacker to read sensitive files from the filesystem. Organizations should prioritize updating to version 3.10.0-rc1 or later.

Recommended defensive actions

• Update to NLTK version 3.10.0-rc1 or later
• Be cautious when loading data from untrusted sources
• Monitor for potential attacks
• Perform a thorough inventory of systems and applications using NLTK
• Implement compensating controls, such as file access restrictions

Evidence notes

The vulnerability was reported via the NVD and CVE.org. The CVE record and NVD detail pages provide additional information on the vulnerability. The vendor has released a patch for the vulnerability, which is included in version 3.10.0-rc1.

Official resources