CVE-2026-40890

{
  "id": "CVE-2026-40890",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-21T20:17:02.810",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778."
    },
    {
      "lang": "es",
      "value": "El paquete “github.com/gomarkdown/markdown” es una biblioteca Go para analizar texto Markdown y renderizar como HTML. Procesar una entrada malformada que contiene un carácter < que no es seguido por un carácter > en ninguna parte del texto restante con un SmartypantsRenderer conducirá a una lectura fuera de límites o a un pánico. Esta vulnerabilidad se corrige con el commit 759bbc3e32073c3bc4e25969c132fc520eda2778."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "gomarkdown",
          "product": "markdown",
          "versions": [
            {
              "version": "< 759bbc3e32073c3bc4e25969c132fc520eda2778",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-21T20:16:21.788511Z",
          "id": "CVE-2026-40890",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:gomarkdown:markdown:*:*:*:*:*:go:*:*",
              "versionEndExcluding": "2026-04-10",
              "matchCriteriaId": "82C227BF-A9A1-4CD5-9664-916EAAB6DDAA"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778",
      "source": "[email protected]",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    }
  ]
}