CVE-2026-50142

{
  "id": "CVE-2026-50142",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-18T22:16:52.633",
  "lastModified": "2026-10-22T17:09:59.477",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.0, a crafted HEIF sequence accepted by heif_context_read_from_memory() with the msf1 sequence brand can cause unbounded heap allocation. In libheif/sequences/seq_boxes.cc, Box_stsz::parse() applies max_sequence_frames only to variable-size samples, so fixed-size mode accepts an attacker-controlled sample_count without a bound. In libheif/sequences/track.cc, Track::load() also adds current_sample_idx and samples_per_chunk in 32-bit arithmetic, allowing the consistency check to be bypassed by wraparound. The resulting values reach the Chunk::Chunk() allocation path, which can consume gigabytes of memory and crash or stall the process through memory exhaustion. This issue is fixed in version 1.23.0."
    },
    {
      "lang": "es",
      "value": "libheif es un decodificador y codificador de formato de archivo HEIF y AVIF. Desde la 1.19.0 hasta la 1.23.0, una secuencia HEIF manipulada aceptada por heif_context_read_from_memory() con la marca de secuencia msf1 puede causar una asignación de memoria dinámica (heap) ilimitada. En libheif/sequences/seq_boxes.cc, Box_stsz::parse() aplica max_sequence_frames solo a muestras de tamaño variable, por lo que el modo de tamaño fijo acepta un sample_count controlado por el atacante sin un límite. En libheif/sequences/track.cc, Track::load() también suma current_sample_idx y samples_per_chunk en aritmética de 32 bits, permitiendo que la verificación de consistencia sea eludida por desbordamiento. Los valores resultantes alcanzan la ruta de asignación de Chunk::Chunk(), lo que puede consumir gigabytes de memoria y bloquear o paralizar el proceso por agotamiento de memoria. Este problema está solucionado en la versión 1.23.0."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "strukturag",
          "product": "libheif",
          "versions": [
            {
              "version": ">= 1.19.0, < 1.23.0",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-19T18:51:41.872528Z",
          "id": "CVE-2026-50142",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-190"
        },
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/strukturag/libheif/commit/a6caa38f7a70d66dc9caec2a7bfe20935b32c622",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/strukturag/libheif/releases/tag/v1.23.0",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-jvmp-j3cw-84mh",
      "source": "[email protected]"
    }
  ]
}