Bug 2525090 (CVE-2026-81723) - CVE-2026-81723 nltk: NLTK: Denial of Service via malformed XML corpus files
Summary: CVE-2026-81723 nltk: NLTK: Denial of Service via malformed XML corpus files
Keywords:
Status: NEW
Alias: CVE-2026-81723
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2527837 2527838
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-27 16:59 UTC by OSIDB Bzimport
Modified: 2026-09-03 07:31 UTC (History)
19 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-08-27 16:59:10 UTC 
NLTK versions before 3.10.3 contain a quadratic CPU exhaustion vulnerability in XMLCorpusView._read_xml_fragment() that rescans accumulated XML fragments on every 1 KiB block read. Attackers can provide malformed XML corpus files to cause severe CPU consumption and denial of service through affected readers like BNCCorpusReader.
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