CVE-2026-126301
- Source
- https://cve.org/CVERecord?id=CVE-2026-126301
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126301.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-126301
- Aliases
- Published
- 2026-11-13T09:36:25Z
- Modified
- 2026-11-15T02:46:05Z
- Severity
-
- 6.9 (Medium) CVSS_V4 - 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 CVSS Calculator
- Summary
- NLTK from 3.6 before 3.10.4 Quadratic CPU Exhaustion via LegalitySyllableTokenizer.tokenize
- Details
-
NLTK from 3.6 before 3.10.4 contains an algorithmic complexity vulnerability in LegalitySyllableTokenizer.tokenize that allows remote attackers to exhaust CPU by supplying long all-vowel tokens. Attackers can submit a token such as a long run of vowels, causing the unguarded onset reversal loop to perform quadratic work and deny service to syllabification components.
- Database specific
{ "cna_assigner": "VulnCheck", "cwe_ids": [ "CWE-407" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126301.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126301.json
- https://github.com/nltk/nltk/security/advisories/GHSA-gpwc-27cw-rh9r
- https://nvd.nist.gov/vuln/detail/CVE-2026-126301
- https://www.vulncheck.com/advisories/nltk-from-3.6-before-3.10.4-quadratic-cpu-exhaustion-via-legalitysyllabletokenizer-tokenize
Affected packages
Git / github.com/nltk/nltk
Affected ranges
- Type
- GIT
- Repo
- https://github.com/nltk/nltk
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "3.6" }, { "fixed": "3.10.4" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "range": [ { "introduced": "3.6" }, { "fixed": "3.10.4" } ], "source": "DESCRIPTION" } ] }