CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
69.2%
The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies. The initial connection to the HTTPS proxy (if an SSLContext isn’t given via proxy_config) doesn’t verify the hostname of the certificate. This means certificates for different servers that still validate properly with the default urllib3 SSLContext will be silently accepted (CVE-2021-28363). An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect (CVE-2021-33503).
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Mageia | 8 | noarch | python-urllib3 | < 1.26.5-1 | python-urllib3-1.26.5-1.mga8 |
bugs.mageia.org/show_bug.cgi?id=29041
github.com/urllib3/urllib3/releases/tag/1.26.3
github.com/urllib3/urllib3/releases/tag/1.26.4
github.com/urllib3/urllib3/releases/tag/1.26.5
lists.fedoraproject.org/archives/list/[email protected]/thread/4S65ZQVZ2ODGB52IC7VJDBUK4M5INCXL/
lists.fedoraproject.org/archives/list/[email protected]/thread/FMUGWEAUYGGHTPPXT6YBD53WYXQGVV73/
lists.fedoraproject.org/archives/list/[email protected]/thread/JWEE334W43EIJUKSMQSEH6ML7VU57K5B/
lists.opensuse.org/archives/list/[email protected]/thread/NYARUF6IH56FOIKBV7PTO7AXODL5GKNT/
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
69.2%