« Volver al listado

CVE-2026-31971

Estado: AnalizadaAlta (7.1)—

HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. When reading data encoded using the `BYTE_ARRAY_LEN` method, the `cram_byte_array_len_decode()` failed to validate that the amount of data being unpacked matched the size of the output buffer where it was to be stored. Depending on the data series being read, this could result either in a heap or a stack overflow with attacker-controlled bytes.

Leer descripción completaMostrar menos

Depending on the data stream this could result either in a heap buffer overflow or a stack overflow. If a user opens a file crafted to exploit this issue it could lead to the program crashing, overwriting of data structures on the heap or stack in ways not expected by the program, or changing the control flow of the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

UI:P requiere interacción del usuario (abrir archivo crafted). Buffer overflow/stack overflow en lectura de datos CRAM puede lograr RCE o crash; no se especifica intérprete concreto.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Restrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network TrafficExecution PreventionBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Htslib — Htslib

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-31971",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-31971",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-03-18T20:15:12.038273Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 7.1,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "PASSIVE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "NONE",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "LOW",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "samtools",
          "product": "htslib",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.21.1"
            },
            {
              "status": "affected",
              "version": ">= 1.22, < 1.22.2"
            },
            {
              "status": "affected",
              "version": "= 1.23"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-03-18T20:16:22.243",
  "references": [
    {
      "url": "https://github.com/samtools/htslib/commit/01cd003b46fa2ebea4d9be5475b11217eb4c11be",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/samtools/htslib/security/advisories/GHSA-jvx4-4wq7-6fmh",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        },
        {
          "lang": "en",
          "value": "CWE-122"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        },
        {
          "lang": "en",
          "value": "CWE-1284"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. When reading data encoded using the `BYTE_ARRAY_LEN` method, the `cram_byte_array_len_decode()` failed to validate that the amount of data being unpacked matched the size of the output buffer where it was to be stored. Depending on the data series being read, this could result either in a heap or a stack overflow with attacker-controlled bytes. Depending on the data stream this could result either in a heap buffer overflow or a stack overflow. If a user opens a file crafted to exploit this issue it could lead to the program crashing, overwriting of data structures on the heap or stack in ways not expected by the program, or changing the control flow of the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue."
    },
    {
      "lang": "es",
      "value": "HTSlib es una biblioteca para leer y escribir formatos de archivo de bioinformática. CRAM es un formato comprimido que almacena datos de alineación de secuencias de ADN utilizando una variedad de codificaciones y métodos de compresión. Al leer datos codificados utilizando el método 'BYTE_ARRAY_LEN', la función 'cram_byte_array_len_decode()' no validó que la cantidad de datos que se estaban desempaquetando coincidiera con el tamaño del búfer de salida donde se iba a almacenar. Dependiendo de la serie de datos que se leyera, esto podría resultar en un desbordamiento de montón o un desbordamiento de pila con bytes controlados por el atacante. Dependiendo del flujo de datos, esto podría resultar en un desbordamiento de búfer en el montón o un desbordamiento de pila. Si un usuario abre un archivo diseñado para explotar este problema, podría provocar el bloqueo del programa, la sobrescritura de estructuras de datos en el montón o la pila de maneras no esperadas por el programa, o el cambio del flujo de control del programa. Podría ser posible usar esto para obtener ejecución de código arbitrario. Las versiones 1.23.1, 1.22.2 y 1.21.1 incluyen correcciones para este problema. No hay una solución alternativa para este problema."
    }
  ],
  "lastModified": "2026-06-17T10:34:52.020",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A069D6B6-FFF6-4DB7-9811-A568ECC4B288",
              "versionEndExcluding": "1.21.1"
            },
            {
              "criteria": "cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D9D525C8-C8AD-4368-A396-EB4D9DA02B1C",
              "versionEndExcluding": "1.22.2",
              "versionStartIncluding": "1.22"
            },
            {
              "criteria": "cpe:2.3:a:htslib:htslib:1.23:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AAA6BBB2-76F3-4372-9BAE-FDE157401EFD"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}