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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
GitHub withdrew this advisory on 2026-11-13
Withdrawn advisories are usually corrections (a false positive, a duplicate, or a scope change), check the original GHSA page linked below for GitHub's own reason.
Affected packages
Vulnerable: < 3.10.4
Details
This advisory has been withdrawn because it is a duplicate of GHSA-ffr9-mgrr-wcvr. This link is maintained to preserve external references.
NLTK from 3.2.5 before 3.10.4 contains an algorithmic complexity vulnerability in TreebankWordTokenizer.span_tokenize that allows remote attackers to cause quadratic CPU consumption through repeated list.pop(0) calls. Attackers can submit long runs of double-quote characters to services span-tokenizing untrusted text, exhausting a CPU core and degrading availability.
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