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CVE-2026-71514

2.5 · LOW

NLTK 3.9.4 through 3.10.2 contains a path traversal vulnerability in CrubadanCorpusReader.

Published Aug 22, 2026CWE-22EPSS 0.17%

Overview

CVE-2026-71514 is a low-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

NLTK 3.9.4 through 3.10.2 contains a path traversal vulnerability in CrubadanCorpusReader. _load_lang_ngrams joins the corpus root with crubadan_code, the column-0 value read from the corpus table.txt mapping file, and opens the result with the builtin open() rather than the pathsec-validated opener, so os.path.join discards the root when that value is absolute and the read escapes the corpus directory without the containment check nltk.pathsec applies when ENFORCE is set. An attacker who controls a corpus package can disclose file contents outside the corpus root through lang_freq, limited to paths ending in -3grams.txt whose contents parse as token count lines.

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/nltkGitHubgithub.com/nltk/nltk/blob/v3.10.2/nltk/corpus/reader/crubadan.py#L90-L98GitHubgithub.com/nltk/nltk/commit/10d34b3f4fe3fec74b76527a409eb0acbac2e8abRefwww.vulncheck.com/advisories/nltk-through-path-traversal-via-crubadancorpusreader-pathsec-bypass

How CyberStrike helps

Frequently asked questions

What is CVE-2026-71514?

CVE-2026-71514 is a low-severity vulnerability. It was published on August 22, 2026 and has a CVSS 3.1 base score of 2.5 (LOW).

How severe is CVE-2026-71514?

This vulnerability has a CVSS 3.1 base score of 2.5, rated LOW. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-71514?

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-2026-71514?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-71514 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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