01 Record

CVE-2026-66393

NLTK before 3.9.4 Denial of Service via JSONTaggedDecoder

HighPUBLISHEDCNA: VulnCheck

Base score8.7 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

02 Description

NLTK before 3.9.4 Denial of Service via JSONTaggedDecoder

Published

2026-08-22 14:12Z2 HR AGO

Last updated

2026-08-22 14:12Z2 HR AGO

Reserved

2026-07-26

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.7)

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Weaknesses

SSVC decision

No CISA-ADP assessment

Data version

5.2

Document digest

cbc59aadaf503d26acbd1eb0775c91d9ce391a3a37805073e7b72484285553f4

VendorProductVersionsPlatforms

nltknltk0 to < 3.9.4—

github.comGitHub Security Advisory (GHSA-rf74-v2fm-23pw)https://github.com/nltk/nltk/security/advisories/GHSA-rf74-v2fm-23pwvendor-advisory
www.vulncheck.comVulnCheck Advisory: NLTK before 3.9.4 Denial of Service via JSONTaggedDecoderhttps://www.vulncheck.com/advisories/nltk-before-denial-of-service-via-jsontaggeddecoderthird-party-advisory