CVE catalog

CVE-2023-26303

markdown-it-py affected and fixed versions

[CVE catalog]

Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions with specially crafted input.

Severity
Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.23% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "markdown-it-py",
      "status": "fixed",
      "release": "sid",
      "version": "4.2.0-4"
    },
    {
      "name": "markdown-it-py",
      "status": "fixed",
      "release": "forky",
      "version": "4.2.0-4"
    },
    {
      "name": "markdown-it-py",
      "status": "fixed",
      "release": "trixie",
      "version": "3.0.0-3"
    },
    {
      "name": "markdown-it-py",
      "status": "fixed",
      "release": "bookworm",
      "version": "2.1.0-5"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1031764,
      "name": "markdown-it-py",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.1.0-5"
    },
    {
      "bug": 1031764,
      "name": "markdown-it-py",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.1.0-5"
    },
    {
      "bug": 1031764,
      "name": "markdown-it-py",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.1.0-5"
    },
    {
      "bug": 1031764,
      "name": "markdown-it-py",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.1.0-5"
    }
  ],
  "distribution_packages": [
    {
      "name": "python-markdown-it-py",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.0-1.2"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.2.0-1.2",
      "provider_record_id": "OPENSUSE-SU-2026:12015-1"
    },
    {
      "name": "python-markdown-it-py",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.0-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "2.2.0-1.1",
      "provider_record_id": "OPENSUSE-SU-2024:12772-1"
    },
    {
      "name": "markdown-it-py",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1.1.0-1",
        "1.1.0-2"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2023-26303"
    }
  ]
}

[Debian bug #1031764]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [python3-markdown-it]Unknown

    Source package: [markdown-it-py]

    Details (2)

    • 2.1.0-5 · all · bookworm

      Fixed · Fixed: 2.1.0-5

      dsa · markdown-it-py · debian · bookworm; dsa · markdown-it-py · debian · 12

    • 2.1.0-5 · all · bookworm

      Fixed · Fixed: 2.1.0-5

      dsa · markdown-it-py · debian · bookworm; dsa · markdown-it-py · debian · 12

[Debian 13 (Trixie)]

  • [python3-markdown-it]Unknown

    Source package: [markdown-it-py]

    Details (2)

    • 3.0.0-3 · all · trixie

      Fixed · Fixed: 2.1.0-5

      dsa · markdown-it-py · debian · 13

    • 3.0.0-3 · all · trixie

      Fixed · Fixed: 2.1.0-5

      dsa · markdown-it-py · debian · 13

[openSUSE Tumbleweed]

  • [python313-markdown-it-py]Unknown

    Source package: [python-markdown-it-py]

    Details (1)

    • 4.2.0-1.2 · noarch · tumbleweed

      Unknown · Fixed: 2.2.0-1.1, 4.2.0-1.2

      Version impact unknown

      dsa · python-markdown-it-py · opensuse · tumbleweed

  • [python314-markdown-it-py]Unknown

    Source package: [python-markdown-it-py]

    Details (1)

    • 4.2.0-1.2 · noarch · tumbleweed

      Unknown · Fixed: 2.2.0-1.1, 4.2.0-1.2

      Version impact unknown

      dsa · python-markdown-it-py · opensuse · tumbleweed

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]