CVE-2026-81725 - NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the read_block method through public APIs like words() and tagged_words() to force repeated rescans and achieve near-quadratic runtime growth. - 漏洞详情

漏洞编号：CVE-2026-81725

风险等级：低危

漏洞来源：CVE

CVE 编号：CVE-2026-81725

CNNVD 编号：-

厂商/产品：- / -

影响范围：-

CWE：CWE-400

发布/更新时间：2026-08-27 / 2026-08-28

漏洞描述

NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that allows attackers to cause quadratic CPU consumption by supplying malformed TEI blocks with many unmatched opening tags. Attackers can exploit lazy regex patterns in the read_block method through public APIs like words() and tagged_words() to force repeated rescans and achieve near-quadratic runtime growth.

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