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CVE-2026-23951

Estado: AnalizadaMedia (5.5)—

SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication.

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)

Sumatrapdfreader — Sumatrapdf

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-23951",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-23951",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-22T21:44:16.346671Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "sumatrapdfreader",
          "product": "sumatrapdf",
          "versions": [
            {
              "status": "affected",
              "version": "<= 3.5.2rel"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-01-22T01:15:52.633",
  "references": [
    {
      "url": "https://github.com/sumatrapdfreader/sumatrapdf/blob/master/src/PalmDbReader.cpp",
      "tags": [
        "Product"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-hj4w-c5x8-p2hv",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "SumatraPDF is a multi-format reader for Windows. All versions contain an off-by-one error in the validation code that only triggers with exactly 2 records, causing an integer underflow in the size calculation. This bug exists in PalmDbReader::GetRecord when opening a crafted Mobi file, resulting in an out-of-bounds heap read that crashes the app. There are no published fixes at the time of publication."
    },
    {
      "lang": "es",
      "value": "SumatraPDF es un lector multiformato para Windows. Todas las versiones contienen un error de off-by-one en el código de validación que solo se activa con exactamente 2 registros, causando un subdesbordamiento de enteros en el cálculo del tamaño. Este error existe en PalmDbReader::GetRecord al abrir un archivo Mobi manipulado, resultando en una lectura de montón fuera de límites que bloquea la aplicación. No hay correcciones publicadas en el momento de la publicación."
    }
  ],
  "lastModified": "2026-06-17T10:22:20.423",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:sumatrapdfreader:sumatrapdf:-:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EDC837AF-B0DA-4A27-8CF4-EE8846526B37"
            }
          ],
          "operator": "OR"
        }
      ]
    }
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  "sourceIdentifier": "security-advisories@github.com"
}