High severity7.5NVD Advisory· Published Aug 22, 2026
CVE-2026-66393
CVE-2026-66393
Description
NLTK versions before 3.9.4 contain an unbounded recursion vulnerability in JSONTaggedDecoder.decode_obj() that allows attackers to cause denial of service by supplying deeply nested JSON structures. Attackers can craft JSON payloads exceeding the recursion limit to trigger an unhandled RecursionError that crashes the Python process.
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Affected products
1Patches
Vulnerability mechanics
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