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OpenAdvisories
High USN-4897-1 1 CVE

pygments vulnerability

Published Mar 30, 2021 · Updated Apr 27, 2026

Ecosystem: Ubuntu

Summary

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.

Fixed packages 3

ReleasePackageFixed in
Ubuntu · 16.04 LTS 16.04:LTS pygments 2.1+dfsg-1ubuntu0.2
Ubuntu · 18.04 LTS 18.04:LTS pygments 2.2.0+dfsg-1ubuntu0.2
Ubuntu · 20.04 LTS 20.04:LTS pygments 2.3.1+dfsg-1ubuntu2.2

Vulnerabilities 1

  • High 7.5
    CVE-2021-27291

    Pygments vulnerable to Regular Expression Denial of Service (ReDoS)

    In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an …

    mediawiki pygments pygments pygments Debian Ubuntu Azure Linux Alpine PyPI

References

  • report
    https://ubuntu.com/security/CVE-2021-27291