Description
NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking, resulting in indefinite CPU saturation and denial of service to all users of the Python process.
Published: 2026-08-26
Score: 8.7 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 26 Aug 2026 10:30:00 +0000

Type Values Removed Values Added
Description NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and TokenSearcher.findall() methods that accept user-supplied regular expressions without validation or timeout. Attackers can supply crafted regex patterns that cause catastrophic backtracking, resulting in indefinite CPU saturation and denial of service to all users of the Python process.
Title NLTK before 3.10.0 ReDoS via Text.findall() unvalidated regex
First Time appeared Nltk
Nltk nltk
Weaknesses CWE-1333
CPEs cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*
Vendors & Products Nltk
Nltk nltk
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-26T16:09:59.270Z

Reserved: 2026-08-25T23:15:39.155Z

Link: CVE-2026-80205

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-26T11:16:39.950

Modified: 2026-08-26T11:16:39.950

Link: CVE-2026-80205

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-26T12:00:05Z

Weaknesses
  • CWE-1333

    Inefficient Regular Expression Complexity