HIGHVulnerability
CVE-2026-78681
NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity declarations in document DTDs. Attackers can craft XML payloads with nested entity declarations that expand from hundreds of bytes to megabytes in memory, causing denial of service.
Properties
- severity
- HIGH
- score
- 7.5
- epss_score
- 0.00294
- cve_id
- CVE-2026-78681
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- published_at
- 2026-08-25T02:16:52.750
- last_modified
- 2026-09-01T20:09:22.720
- epss_percentile
- 0.2169
Related Entities (4)
ENRICHED_BY (1)
→[Source]FIRST EPSS
AFFECTS_PRODUCT (1)
→[Product]
HAS_WEAKNESS (1)
→[Weakness]Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
DESCRIBED_BY (1)
→[Source]NVD
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