{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"important"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2021-43854","title":"Title"},{"category":"description","text":"NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. Versions prior to 3.6.5 are vulnerable to regular expression denial of service (ReDoS) attacks. The vulnerability is present in PunktSentenceTokenizer, sent_tokenize and word_tokenize. Any users of this class, or these two functions, are vulnerable to the ReDoS attack. In short, a specifically crafted long input to any of these vulnerable functions will cause them to take a significant amount of execution time. If your program relies on any of the vulnerable functions for tokenizing unpredictable user input, then we would strongly recommend upgrading to a version of NLTK without the vulnerability. For users unable to upgrade the execution time can be bounded by limiting the maximum length of an input to any of the vulnerable functions. Our recommendation is to implement such a limit.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2021-43854","url":"https://www.suse.com/security/cve/CVE-2021-43854"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1194059 for CVE-2021-43854","url":"https://bugzilla.suse.com/1194059"}],"title":"SUSE CVE CVE-2021-43854","tracking":{"current_release_date":"2025-02-17T05:05:31Z","generator":{"date":"2023-02-15T03:36:45Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2021-43854","initial_release_date":"2023-02-15T03:36:45Z","revision_history":[{"date":"2023-02-15T03:36:45Z","number":"2","summary":"Current version"},{"date":"2025-01-01T04:08:11Z","number":"3","summary":"Current version"},{"date":"2025-02-15T04:42:55Z","number":"4","summary":"Current version"},{"date":"2025-02-17T05:05:31Z","number":"5","summary":"Current version"}],"status":"interim","version":"5"}}}