CVE-2026-40493

{
  "id": "CVE-2026-40493",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-18T03:16:13.440",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to commit c930284445ea3ff94451ccd7a57c999eca3bc979, the PSD codec computes bytes-per-pixel (`bpp`) from raw header fields `channels * depth`, but the pixel buffer is allocated based on the resolved pixel format. For LAB mode with `channels=3, depth=16`, `bpp = (3*16+7)/8 = 6`, but the format `BPP40_CIE_LAB` allocates only 5 bytes per pixel. Every pixel write overshoots, causing a deterministic heap buffer overflow on every row. Commit c930284445ea3ff94451ccd7a57c999eca3bc979 contains a patch."
    },
    {
      "lang": "es",
      "value": "SAIL es una biblioteca multiplataforma para cargar y guardar imágenes con soporte para animación, metadatos y perfiles ICC. Antes del commit c930284445ea3ff94451ccd7a57c999eca3bc979, el códec PSD calcula los bytes por píxel (’bpp’) a partir de los campos de encabezado sin procesar ’channels * depth’, pero el búfer de píxeles se asigna basándose en el formato de píxel resuelto. Para el modo LAB con ’channels=3, depth=16’, ’bpp = (316+7)/8 = 6’, pero el formato ’BPP40_CIE_LAB’ asigna solo 5 bytes por píxel. Cada escritura de píxel se excede, causando un desbordamiento de búfer de pila determinista en cada fila. El commit c930284445ea3ff94451ccd7a57c999eca3bc979 contiene un parche."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "HappySeaFox",
          "product": "sail",
          "versions": [
            {
              "version": "< c930284445ea3ff94451ccd7a57c999eca3bc979",
              "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:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-20T16:11:59.642196Z",
          "id": "CVE-2026-40493",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/HappySeaFox/sail/commit/c930284445ea3ff94451ccd7a57c999eca3bc979",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv",
      "source": "[email protected]"
    }
  ]
}