CVE-2026-49839

{
  "id": "CVE-2026-49839",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-25T18:16:38.917",
  "lastModified": "2026-10-25T22:10:00.150",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "jq is a command-line JSON processor. Prior to 1.8.2,` jq --rawfile` can turn a handled oversized-string error into invalid-state reuse and a real heap out-of-bounds write in assertion-disabled builds. When jv_load_file(raw=1) reads an attacker-controlled file, it repeatedly appends file chunks to the same jv string accumulator. Once jv_string_append_buf() returns jv_invalid_with_msg(\"String too long\"), the raw-file loop does not stop. If the file contains at least one more byte, the next loop iteration appends a new chunk to an object that is already invalid. With assertions enabled this aborts in jvp_string_ptr(). With assertions disabled, the invalid object is interpreted as a string object and ASan reports heap-buffer-overflow. This vulnerability is fixed in 1.8.2."
    },
    {
      "lang": "es",
      "value": "jq es un procesador JSON de línea de comandos. Antes de 1.8.2, ’jq --rawfile’ puede convertir un error de cadena sobredimensionada manejado en una reutilización de estado inválido y una escritura real fuera de límites del heap en compilaciones con aserciones deshabilitadas. Cuando jv_load_file(raw=1) lee un archivo controlado por el atacante, añade repetidamente fragmentos de archivo al mismo acumulador de cadenas jv. Una vez que jv_string_append_buf() devuelve jv_invalid_with_msg(’String too long’), el bucle de archivo raw no se detiene. Si el archivo contiene al menos un byte más, la siguiente iteración del bucle añade un nuevo fragmento a un objeto que ya es inválido. Con las aserciones habilitadas, esto aborta en jvp_string_ptr(). Con las aserciones deshabilitadas, el objeto inválido se interpreta como un objeto de cadena y ASan informa de un desbordamiento de búfer del heap. Esta vulnerabilidad está corregida en 1.8.2."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "jqlang",
          "product": "jq",
          "versions": [
            {
              "version": "< 1.8.2",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-25T17:55:24.168681Z",
          "id": "CVE-2026-49839",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:jqlang:jq:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "1.8.2",
              "matchCriteriaId": "33B35B19-67AD-450E-A887-48A290566047"
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  ],
  "references": [
    {
      "url": "https://github.com/jqlang/jq/security/advisories/GHSA-cfh2-vwfq-qfmm",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/jqlang/jq/security/advisories/GHSA-cfh2-vwfq-qfmm",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
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    }
  ]
}