Urllib3 Python Urllib3

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By the Year

In 2022 there have been 0 vulnerabilities in Python Urllib3 . Last year Urllib3 had 2 security vulnerabilities published. Right now, Urllib3 is on track to have less security vulnerabilities in 2022 than it did last year.

Year Vulnerabilities Average Score
2022 0 0.00
2021 2 7.00
2020 2 7.00
2019 2 6.80
2018 1 9.80

It may take a day or so for new Urllib3 vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.

Recent Python Urllib3 Security Vulnerabilities

An issue was discovered in urllib3 before 1.26.5

CVE-2021-33503 7.5 - High - June 29, 2021

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.

Resource Exhaustion

The urllib3 library 1.26.x before 1.26.4 for Python omits SSL certificate validation in some cases involving HTTPS to HTTPS proxies

CVE-2021-28363 6.5 - Medium - March 15, 2021

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.

Improper Certificate Validation

urllib3 before 1.25.9

CVE-2020-26137 6.5 - Medium - September 30, 2020

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.

Injection

The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python

CVE-2020-7212 7.5 - High - March 06, 2020

The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).

Resource Exhaustion

The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different

CVE-2019-11324 7.5 - High - April 18, 2019

The urllib3 library before 1.24.2 for Python mishandles certain cases where the desired set of CA certificates is different from the OS store of CA certificates, which results in SSL connections succeeding in situations where a verification failure is the correct outcome. This is related to use of the ssl_context, ca_certs, or ca_certs_dir argument.

Improper Certificate Validation

In the urllib3 library through 1.24.1 for Python

CVE-2019-11236 6.1 - Medium - April 15, 2019

In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.

CRLF Injection

urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e

CVE-2018-20060 9.8 - Critical - December 11, 2018

urllib3 before version 1.23 does not remove the Authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the Authorization header to be exposed to unintended hosts or transmitted in cleartext.

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