GHSA-pq64-v7f5-gqh8
Vulnerability from github
Published
2021-03-29 16:33
Modified
2024-10-14 16:10
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Summary
Pygments vulnerable to Regular Expression Denial of Service (ReDoS)
Details

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.

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{
   affected: [
      {
         package: {
            ecosystem: "PyPI",
            name: "Pygments",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "1.1",
                  },
                  {
                     fixed: "2.7.4",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
      },
   ],
   aliases: [
      "CVE-2021-27291",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-400",
      ],
      github_reviewed: true,
      github_reviewed_at: "2021-03-22T20:28:40Z",
      nvd_published_at: "2021-03-17T13:15:00Z",
      severity: "HIGH",
   },
   details: "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.",
   id: "GHSA-pq64-v7f5-gqh8",
   modified: "2024-10-14T16:10:54Z",
   published: "2021-03-29T16:33:03Z",
   references: [
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-27291",
      },
      {
         type: "WEB",
         url: "https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14",
      },
      {
         type: "WEB",
         url: "https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce",
      },
      {
         type: "PACKAGE",
         url: "https://github.com/pygments/pygments",
      },
      {
         type: "WEB",
         url: "https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml",
      },
      {
         type: "WEB",
         url: "https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html",
      },
      {
         type: "WEB",
         url: "https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html",
      },
      {
         type: "WEB",
         url: "https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html",
      },
      {
         type: "WEB",
         url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55",
      },
      {
         type: "WEB",
         url: "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ",
      },
      {
         type: "WEB",
         url: "https://www.debian.org/security/2021/dsa-4878",
      },
      {
         type: "WEB",
         url: "https://www.debian.org/security/2021/dsa-4889",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
         type: "CVSS_V3",
      },
      {
         score: "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
         type: "CVSS_V4",
      },
   ],
   summary: "Pygments vulnerable to Regular Expression Denial of Service (ReDoS)",
}


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