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Advisories

NLTK before 3.10.3 Denial of Service via Uncontrolled Recursion

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severity
medium
date
Affecting

  • nltk >= 0, < 3.10.3

CWE
  • CWE-674 Uncontrolled Recursion
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Credit
JoshgunAbdullayev
Description
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.

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