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CVE-2026-78681: nltk before 3.10.3 (exclusive), 0 to before 3.10.3
CVE-2026-78681. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.00521 (percentile 0.42541), scored 11-Oct-2026.
Affected technology
nltk · before 3.10.3 (exclusive)
nltk
nltk · 0 to before 3.10.3
nltk
Description’s affected range: versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required
What an attacker can do
Attackers can craft XML payloads with nested entity declarations that expand from hundreds of bytes to megabytes in memory, causing denial of service. Vendor/CNA’s CVSS 4.0 assessment (base score 8.7/10) rates confidentiality and integrity impact as none; availability impact as high.
- CWE
- CWE-776
- CCR priority
- 30.1 /100 (P4)
- CVSS 3.1
- 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
- EPSS
- 0.00521 · percentile 0.42564 · 2026-10-12
- KEV
- no
Provenance
- FIRST EPSS daily exploit-probability · Source record · observed 2026-10-13 01:52:16.607887+00:00 UTC
- NVD CVE API 2.0 · Source record · observed 2026-10-13 01:49:08.152775+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-78681.html