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THREAT OPS › Threat News › [NVD] CVE-2026-66393 (HIGH 7.5) — 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 unh

[NVD] CVE-2026-66393 (HIGH 7.5) — 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 unh

mednvdPublished 2026-08-22

CVE-2026-66393 CVSS: 7.5 HIGH Published: 2026-08-22T15:16:19.633

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.

Indicators of compromise

CVE-2026-66393cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-66393