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CVE-2026-31968

Estado: AnalizadaAlta (8.8)—

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. For the `VARINT` and `CONST` encodings, incomplete validation of the context in which the encodings were used could result in up to eight bytes being written beyond the end of a heap allocation, or up to eight bytes being written to the location of a one byte variable on the stack, possibly causing the values to adjacent variables to change unexpectedly.

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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.

Vector AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). Buffer overflow en lectura de archivo CRAM permite ejecución de código (T1059) o crash del programa (DoS T1499.004).

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

Privileged Account ManagementFilter Network TrafficVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software Installation

Tecnologías afectadas (1)

Htslib — Htslib

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-31968",
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-03-18T19:57:24.242380Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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  "published": "2026-03-18T20:16:21.480",
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      "url": "https://github.com/samtools/htslib/commit/0ec436796eca7b4ce7fcc9b77270c102da29bb2e",
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          "value": "CWE-122"
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          "value": "CWE-787"
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      "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. For the `VARINT` and `CONST` encodings, incomplete validation of the context in which the encodings were used could result in up to eight bytes being written beyond the end of a heap allocation, or up to eight bytes being written to the location of a one byte variable on the stack, possibly causing the values to adjacent variables to change unexpectedly. 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. Para las codificaciones 'VARINT' y 'CONST', la validación incompleta del contexto en el que se utilizaron las codificaciones podría resultar en la escritura de hasta ocho bytes más allá del final de una asignación de memoria en el montón, o en la escritura de hasta ocho bytes en la ubicación de una variable de un byte en la pila, posiblemente causando que los valores de las variables adyacentes cambien inesperadamente. 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 formas 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 existe una solución alternativa para este problema."
    }
  ],
  "lastModified": "2026-06-17T10:34:51.650",
  "configurations": [
    {
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