- Description
- 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.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
- Products
- urllib3
CVSS 4.0
- Type
- Secondary
- Base score
- 8.9
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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
- Severity
- HIGH
CVSS 3.1
- Type
- Primary
- Base score
- 7.5
- Impact score
- 3.6
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Severity
- HIGH
- security-advisories@github.com
- CWE-770
- Hype score
- Not currently trending
🛡️ #DevOps Alert! Two new vulnerabilities (CVE-2025-66418 & CVE-2025-66471) in python-urllib3 are putting #SUSE Linux Micro 6.1 systems at risk. Read mroe: 👉 https://t.co/yj5aMbHKfU #Security https://t.co/WvJEFtGpJV
@Cezar_H_Linux
27 Feb 2026
44 Impressions
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Urgent: #openSUSE Leap 16.0 security update for python-urllib3 fixes 3 DoS flaws (CVE-2025-66471, CVE-2025-66418, CVE-2026-21441). Read more: 👉 https://t.co/9VHYKIbhsI #Security #Linux https://t.co/q4gKPJWZxz
@Cezar_H_Linux
27 Feb 2026
49 Impressions
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🚨 CRITICAL: CVE-2025-66418 in #Python urllib3 allows HTTP request smuggling. Mageia advisory 2026-0011 released. Read more: 👉 https://t.co/WqTo2DKaWO #Security https://t.co/OtJVQAh7pf
@Cezar_H_Linux
17 Jan 2026
74 Impressions
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[
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*",
"matchCriteriaId": "AE1F753E-4D9D-48B1-B893-B3FD39917478",
"versionEndExcluding": "2.6.0",
"versionStartIncluding": "1.24",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
]