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[USN-9060-1] kramdown vulnerability

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9060-1
November 11, 2026

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

kramdown could be made to expose sensitive information or run programs if
it opened a specially crafted file.

Software Description:
- ruby-kramdown: Fast, pure-Ruby Markdown-superset converter

Details:

It was discovered that kramdown processed the template option in documents
by default. An attacker could possibly use this issue to read arbitrary
files or execute arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS
ruby-kramdown 1.15.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
ruby-kramdown 1.10.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-9060-1
CVE-2020-14001

--===============3702649004731689116==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature

 

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