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Date: Thu, 18 Apr 2019 20:40:56 -0400
From: Havoc Pennington <>
Subject: Re: urllib3: adds system certificates to ssl_context


This vulnerability "urllib3: adds system certificates to ssl_context"
has been assigned CVE-2019-11324

Thank you

On Wed, Apr 17, 2019 at 2:21 PM Havoc Pennington <> wrote:
> A vulnerability has been discovered in the urllib3 Python library.
> When verifying HTTPS connections when an SSLContext is passed to
> urllib3, system CA certificates will be loaded into the SSLContext
> by default in addition to any manually-specified CA certificates.
> This causes TLS handshakes that should fail given only the
> manually specified certs to succeed based on system CA certs.
> This affects urllib3 1.24.1 and below. The fix has been released
> in version 1.24.2.
> The vulnerability was reported by Christian Heimes.
> A CVE ID has been requested, will follow up with it when we have it.
> Best
> Havoc / on behalf of Tidelift security team & urllib3 team

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