CVE-2026-81724
Medium · 5.3CVSS
5.3
EPSS
0.5%
Published
Aug 27, 2026
CISA due date
—
The record
NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows unauthenticated attackers to cause a denial of service by supplying deeply nested feature-structure input. Attackers can craft trivial payloads with nested brackets that exceed Python's recursion limit and raise an unhandled RecursionError, crashing applications that parse user-supplied feature structures or feature grammars.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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