{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/markdown2",
          "product": "python-markdown2",
          "vendor": "trentm",
          "versions": [
            {
              "lessThanOrEqual": "2.5.5",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "2.5.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhammadyusuf Dilmurodov (agrresore)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "ParamTanna"
        }
      ],
      "datePublic": "2026-10-28T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated \u0027[a](\u0027 or \u0027![a](\u0027 sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T21:11:20.814Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Issue #750",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/trentm/python-markdown2/issues/750"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/trentm/python-markdown2"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L1478-L1492"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/trentm/python-markdown2/blob/2.5.5/lib/markdown2.py#L3029"
        },
        {
          "tags": [
            "patch",
            "issue-tracking"
          ],
          "url": "https://github.com/trentm/python-markdown2/pull/751"
        },
        {
          "name": "VulnCheck Advisory: python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/python-markdown2-through-2.5.5-denial-of-service-via-unclosed-inline-link-destinations"
        }
      ],
      "title": "python-markdown2 through 2.5.5 Denial of Service via Unclosed Inline Link Destinations",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-118694",
    "datePublished": "2026-10-28T21:11:20.814Z",
    "dateReserved": "2026-10-28T17:31:29.498Z",
    "dateUpdated": "2026-10-28T21:11:20.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}