CVE-2021-20270: Infinite Loop in Pygments

CVE-2021-20270 · Severity: low · CVSS 3.1 · Published 2021-03-23

An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.

Technologies: pygments (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2021-20270 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2021-20270 being exploited in the wild.
How severe is CVE-2021-20270?
Low severity, with a CVSS score of 3.1, published 23 March 2021.
Which products and versions are affected?
pygments (PyPI) ECOSYSTEM:introduced=1.5,fixed=2.7.4.
Is there a fix for CVE-2021-20270?
Yes. pygments (PyPI): upgrade to 2.7.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-20270?
Check whether you run pygments (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • pygments (PyPI): upgrade to 2.7.4 or later
    pip install "pygments>=2.7.4"

Affected products

  • pygments (PyPI) ECOSYSTEM:introduced=1.5,fixed=2.7.4

Identifiers

  • CVE-2021-20270
  • GHSA-9w8r-397f-prfh
  • PYSEC-2021-140

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