CVE-2026-63310
⚠️ highSummary
NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation.
CVSS Score
7.1
High
EPSS Score
0.2
Exploit Probability
Published Date
2026-08-22
First Seen: 2026-08-23
📊 Relative Risk Intelligence
This CVE is Moderate Risk - more severe than 52.3% of all 348,756 vulnerabilities in our database.
#166,188
Above average severity
Severity Percentile
Last Modified
2026-08-22
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H
CVSS Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE IDs (Weakness Types)