cvedb.io
CVE-2016-9015
LOW · CVSS 3.7
EPSS exploitation probability: 0%
Published 2017-01-11T16:59:00.347 · Last modified 2026-06-17T00:55:17.957

Summary

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.

Affected products

python — urllib3

Does this affect you?

Add your gear to cvedb and we'll alert you only when python ships something exploited.

Check my exposure →

References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.