nltk: NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows u...
CVE-2026-81724 is fixed in nltk on 1 platform by DEBIAN-CVE-2026-81724 (version 3.10.3-1), released August 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nltk · Debian 14 | 3.10.3-1 | DEBIAN-CVE-2026-81724 | Aug 28, 2026 |
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