VDB
DEBIAN-CVE-2025-66418
DEBIAN-CVE-2025-66418
PUBLISHED
CVSS 7.5 HIGH
urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.
Risk Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | python-urllib3 | 0, 1.26.12-1, 1.26.12-1 |
| Debian:11 | python-urllib3 | 0, 1.26.5-1~exp1, 1.26.5-1~exp1+deb11u1 |
| Debian:13 | python-urllib3 | 2.3.0-3, 0, 2.3.0-3 |
| Debian:14 | python-urllib3 | 2.3.0-3, 0, 2.5.0-1 |
Timeline
- Dec 5, 2025 CVE Published
- Apr 28, 2026 CVE Updated