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[USN-9085-1] Ruby OpenID vulnerability

Posted on 13 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9085-1
November 12, 2026

ruby-openid vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Ruby OpenID could be made to connect to arbitrary servers.

Software Description:
- ruby-openid: Ruby library for verifying and serving OpenID identities

Details:

It was discovered that Ruby OpenID sent a request to the claimed identifier
URL before verifying the signature of an OpenID response. A remote attacker
could possibly use this issue to perform server-side request forgery
attacks.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
ruby-openid 2.7.0debian-1ubuntu0.18.04.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
ruby-openid 2.7.0debian-1ubuntu0.16.04.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-9085-1
CVE-2019-11027

--===============4927918927121695386==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

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