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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...
CVE-2021-27291
First seen on SecPulse
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2021-27291 py3-pygments Fixed in: 2.5.2-r1
- Debian DEBIAN-CVE-2021-27291 mediawiki Fixed in: 1:1.35.2-1
- Ubuntu UBUNTU-CVE-2021-27291 pygments Fixed in: 1.6+dfsg-1ubuntu1.1+esm1
Original description The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory lists.debian.org
- advisory lists.debian.org
- advisory lists.debian.org
- advisory debian.org
- advisory debian.org
- patch github.com
- report gist.github.com
- web lists.fedoraproject.org
- web lists.fedoraproject.org