Search/CVE-2026-78681
● CVE — High

CVE-2026-78681

VendornltkProductnltkDiscoveredAug 25, 2026UpdatedSep 1, 2026

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.

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CVSS v3.1
7.5 HIGH
EPSS
0.52%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 26, 2026 → Sep 25, 2026
▲ 0.24pp
0.28% → 0.52% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityNONE
IntegrityNONE
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Connections
2 relationships
Timeline
disclosure → media coverage
Aug 25, 2026
Disclosure — published as a CVE record. · last revised by NVD Sep 1, 2026