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GHSA-pq64-v7f5-gqh8

Pygments vulnerable to Regular Expression Denial of Service (ReDoS)

Source: GitHub Advisory Database (reviewed) High CVE-2021-27291

Packages

EcosystemPackageAffectedFixed in
PyPI Pygments >= 1.1, < 2.7.4 2.7.4

Details

As written in the advisory (Markdown source, shown as plain text).

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 attacker can cause a denial of service.

References

External links from the advisory. They lead to third-party sites.