Python Urllib3
By the Year
In 2023 there have been 0 vulnerabilities in Python Urllib3 . Urllib3 did not have any published security vulnerabilities last year.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2023 | 0 | 0.00 |
| 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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