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Ubuntu Security Notice USN-4897-1
March 30, 2021

pygments vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Pygments could be made to hang if it opened a specially crafted file.

Software Description:
- pygments: Generic syntax highlighter

Details:

Ben Caller discovered that Pygments incorrectly handled parsing certain
files. If a user or automated system were tricked into parsing a specially
crafted file, a remote attacker could cause Pygments to hang or consume
resources, resulting in a denial of service.

Update instructions:

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

Ubuntu 20.10:
  python3-pygments                2.3.1+dfsg-4ubuntu0.2

Ubuntu 20.04 LTS:
  python-pygments                 2.3.1+dfsg-1ubuntu2.2
  python3-pygments                2.3.1+dfsg-1ubuntu2.2

Ubuntu 18.04 LTS:
  python-pygments                 2.2.0+dfsg-1ubuntu0.2
  python3-pygments                2.2.0+dfsg-1ubuntu0.2

Ubuntu 16.04 LTS:
  python-pygments                 2.1+dfsg-1ubuntu0.2
  python3-pygments                2.1+dfsg-1ubuntu0.2

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

References:
  https://ubuntu.com/security/notices/USN-4897-1
  CVE-2021-27291

Package Information:
  https://launchpad.net/ubuntu/+source/pygments/2.3.1+dfsg-4ubuntu0.2
  https://launchpad.net/ubuntu/+source/pygments/2.3.1+dfsg-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/pygments/2.2.0+dfsg-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/pygments/2.1+dfsg-1ubuntu0.2