CVSS 4.0
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, без особени условия, без вход и без действие от потребителя.
- Експлоатация: има публичен пример за експлоатация
- Атаката може да се автоматизира
Описание
Оригинално описание
The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORD_RE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix [a-z0-9]+(?:[.\-][a-z0-9]+)* is unbounded. Input consisting of many alternating label separators can be partitioned in exponentially many ways, and because the branch also requires a trailing top-level domain that such input never supplies, the engine explores those partitions before failing at each offset. A few kilobytes of input therefore consumes seconds to minutes of single-threaded CPU, and the HANG_RE substitution performed before matching does not collapse the pattern. TweetTokenizer is intended for tokenizing untrusted social-media text, so any service that applies it, or the module-level casual_tokenize, to submitted text can be stalled per request without authentication. Version 3.10.1 bounds the label repetition.
Засегнати продукти
- nltk nltk: преди 3.10.1; 3.10.1
Вид слабост
История
- 20 август 2026 Публикувано
Други уязвимости в nltk nltk
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-72818
- https://nvd.nist.gov/vuln/detail/CVE-2026-72818
- https://github.com/nltk/nltk/issues/3704
- https://github.com/nltk/nltk/blob/3.9.4/nltk/tokenize/casual.py
- https://github.com/nltk/nltk/releases/tag/v3.10.1
- https://github.com/nltk/nltk
- https://www.vulncheck.com/advisories/nltk-tweettokenizer-url-pattern-backtracks-catastrophically-on-naked-domain-like-input