# CVE-2019-11324: Improper Certificate Validation in urllib3

Source: https://junglewise.ai/threats/cve-2019-11324-improper-certificate-validation-in-urllib3  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2019-04-18  
License: CC BY 4.0 with a link back

CVE-2019-11324 · Severity: low · CVSS 3 · Published 2019-04-18

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.

Technologies: [urllib3 (PyPI)](https://junglewise.ai/threats/technologies/urllib3). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2019-11324 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-11324 being exploited in the wild.

**How severe is CVE-2019-11324?** Low severity, with a CVSS score of 3, published 18 April 2019.

**Which products and versions are affected?** urllib3 (PyPI) ECOSYSTEM:introduced=0,fixed=1.24.2.

**Is there a fix for CVE-2019-11324?** Yes. urllib3 (PyPI): upgrade to 1.24.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-11324?** Check whether you run urllib3 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- urllib3 (PyPI): upgrade to 1.24.2 or later

  ```sh
  pip install "urllib3>=1.24.2"
  ```


## Affected products

- urllib3 (PyPI) ECOSYSTEM:introduced=0,fixed=1.24.2

## Identifiers

- CVE-2019-11324
- GHSA-mh33-7rrq-662w
- PYSEC-2019-133

## Related threats

- [urllib3 HTTP client unbounded memory allocation in chunked transfer](https://junglewise.ai/threats/cve-2026-97689-urllib3-is-an-http-client-library-for-python-from-1-10-3-until-2)
- [urllib3 infinite loop in Deflate decoder](https://junglewise.ai/threats/cve-2026-97688-urllib3-is-an-http-client-library-for-python-from-2-6-2-until-2-8)
- [urllib3 HTTPS proxy TLS settings isolation](https://junglewise.ai/threats/cve-2026-97687-urllib3-is-an-http-client-library-for-python-from-1-26-0-until-2)
- [PYSEC-2026-1997 - urllib3 does not control redirects in browsers and Node.js](https://junglewise.ai/threats/cve-2025-50182-urllib3-does-not-control-redirects-in-browsers-and-node-js)
- [PYSEC-2026-1999 - urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation](https://junglewise.ai/threats/cve-2025-50181-urllib3-redirects-are-not-disabled-when-retries-are-disabled-on)