ubuntu-cve-2022-39209
Vulnerability from osv_ubuntu
Published
2022-09-15 18:15
Modified
2026-04-22 07:41
Summary
Details

cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "cmark-gfm",
            "binary_version": "0.29.0.gfm.0-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "libcmark-gfm-extensions0",
            "binary_version": "0.29.0.gfm.0-4ubuntu0.1~esm1"
          },
          {
            "binary_name": "libcmark-gfm0",
            "binary_version": "0.29.0.gfm.0-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "cmark-gfm",
        "purl": "pkg:deb/ubuntu/cmark-gfm@0.29.0.gfm.0-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.29.0.gfm.0-4ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.28.3.gfm.20-3",
        "0.29.0.gfm.0-3",
        "0.29.0.gfm.0-4"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "cmark-gfm",
            "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "libcmark-gfm-extensions0.29.0.gfm.3",
            "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "libcmark-gfm0.29.0.gfm.3",
            "binary_version": "0.29.0.gfm.3-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "cmark-gfm",
        "purl": "pkg:deb/ubuntu/cmark-gfm@0.29.0.gfm.3-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.29.0.gfm.3-3ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.29.0.gfm.0-6",
        "0.29.0.gfm.2-1",
        "0.29.0.gfm.2-1+really.0.29.0.gfm.0ubuntu1",
        "0.29.0.gfm.2-2",
        "0.29.0.gfm.3-3"
      ]
    }
  ],
  "aliases": [],
  "details": "cmark-gfm is GitHub\u0027s fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm\u0027s autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c \u0027print(\"![l\"* 100000 + \"\\n\")\u0027 | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.",
  "id": "UBUNTU-CVE-2022-39209",
  "modified": "2026-04-22T07:41:40Z",
  "published": "2022-09-15T18:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2022-39209"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q"
    },
    {
      "type": "REPORT",
      "url": "https://en.wikipedia.org/wiki/Time_complexity"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/github/cmark-gfm/commit/9d57d8a23142b316282bdfc954cb0ecda40a8655"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2022-39209"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7319-1"
    }
  ],
  "related": [
    "USN-7319-1"
  ],
  "schema_version": "1.7.0",
  "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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2022-39209"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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