CVE-2016-9015

Description

Versions 1.17 and 1.18 of the Python urllib3 library suffer from a vulnerability that can cause them, in certain configurations, to not correctly validate TLS certificates. This places users of the library with those configurations at risk of man-in-the-middle and information leakage attacks. This vulnerability affects users using versions 1.17 and 1.18 of the urllib3 library, who are using the optional PyOpenSSL support for TLS instead of the regular standard library TLS backend, and who are using OpenSSL 1.1.0 via PyOpenSSL. This is an extremely uncommon configuration, so the security impact of this vulnerability is low.

How to fix CVE-2016-9015

To remediate CVE-2016-9015, upgrade the affected package to a fixed version below.

• —upgrade to 1.18.1 or later
• —upgrade to 1.18.1 or later

Is CVE-2016-9015 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• >= 1.17, < 1.18.1
• >= 1.17, < 1.18.1

CVSS scores

References (8)

• ADVISORYgithub.com/advisories/GHSA-v4w5-p2hg-8fh6
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2016-9015
• PATCHgithub.com/urllib3/urllib3
• WEBgithub.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2017-98.yaml