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CVE-2026-4923

Estado: AnalizadaMedia (5.9)—

Impact:

When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path.

Unsafe examples:

/*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y

Safe examples:

/*foo-:bar /*foo-:bar-*baz

Patches:

Upgrade to version 8.4.0.

Workarounds:

If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Pillarjs — Path-to-regexp

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-4923",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-4923",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-27T13:46:47.360477Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "affectedData": [
        {
          "vendor": "path-to-regexp",
          "product": "path-to-regexp",
          "versions": [
            {
              "status": "affected",
              "version": "8.0.0",
              "lessThan": "8.4.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "8.4.0",
              "versionType": "semver"
            }
          ],
          "packageURL": "pkg:npm/path-to-regexp",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-03-26T19:17:08.187",
  "references": [
    {
      "url": "https://cna.openjsf.org/security-advisories.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Impact:\n\nWhen using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path.\n\nUnsafe examples:\n\n/*foo-*bar-:baz\n/*a-:b-*c-:d\n/x/*a-:b/*c/y\n\nSafe examples:\n\n/*foo-:bar\n/*foo-:bar-*baz\n\nPatches:\n\nUpgrade to version 8.4.0.\n\nWorkarounds:\n\nIf you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable."
    },
    {
      "lang": "es",
      "value": "Impacto:\n\nAl usar múltiples comodines, combinados con al menos un parámetro, se puede generar una expresión regular que es vulnerable a ReDoS. Esta vulnerabilidad de retroceso requiere que el segundo comodín esté en un lugar distinto al final de la ruta.\n\nEjemplos no seguros:\n\n/*foo-*bar-:baz\n/*a-:b-*c-:d\n/x/*a-:b/*c/y\n\nEjemplos seguros:\n\n/*foo-:bar\n/*foo-:bar-*baz\n\nParches:\n\nActualice a la versión 8.4.0.\n\nSoluciones alternativas:\n\nSi está utilizando múltiples parámetros comodín, puede verificar la salida de la expresión regular con una herramienta como https://makenowjust-labs.github.io/recheck/playground/ para confirmar si una ruta es vulnerable."
    }
  ],
  "lastModified": "2026-06-17T10:57:27.740",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DB421812-F7E3-4CC5-B02B-53CCBFDFB671",
              "versionEndExcluding": "8.4.0",
              "versionStartIncluding": "8.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb"
}