What is GHSA-x4p7-2mv3-x7px?

GHSA-x4p7-2mv3-x7px is a security advisory published by GitHub Security Advisories with Medium severity. NLTK from 3.6 before 3.10.4 contains an algorithmic complexity vulnerability in...

Which CVE IDs does GHSA-x4p7-2mv3-x7px cover?

GHSA-x4p7-2mv3-x7px covers the following CVE IDs: CVE-2026-126301. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-x4p7-2mv3-x7px?

GHSA-x4p7-2mv3-x7px has a CVSS v3 base score of 5.3, published by GitHub Security Advisories.

GHSA-x4p7-2mv3-x7pxMediumCVSS 5.3

NLTK from 3.6 before 3.10.4 contains an algorithmic complexity vulnerability in...

Vendor

GitHub Security Advisories

Published

November 13, 2026

Last Modified

November 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-126301 →

📋 Description

NLTK from 3.6 before 3.10.4 contains an algorithmic complexity vulnerability in LegalitySyllableTokenizer.tokenize that allows remote attackers to exhaust CPU by supplying long all-vowel tokens. Attackers can submit a token such as a long run of vowels, causing the unguarded onset reversal loop to perform quadratic work and deny service to syllabification components.

🔗 References (4)

https://github.com/nltk/nltk/security/advisories/GHSA-gpwc-27cw-rh9r
https://nvd.nist.gov/vuln/detail/CVE-2026-126301
https://www.vulncheck.com/advisories/nltk-from-3.6-before-3.10.4-quadratic-cpu-exhaustion-via-legalitysyllabletokenizer-tokenize
https://github.com/advisories/GHSA-x4p7-2mv3-x7px