FKIE_CVE-2026-40493

Vulnerability from fkie_nvd - Published: 2026-04-18 03:16 - Updated: 2026-10-26 22:10
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/HappySeaFox/sail/commit/c930284445ea3ff94451ccd7a57c999eca3bc979
security-advisories@github.comhttps://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "sail",
          "vendor": "HappySeaFox",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c c930284445ea3ff94451ccd7a57c999eca3bc979"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "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 im\u00e1genes con soporte para animaci\u00f3n, metadatos y perfiles ICC. Antes del commit c930284445ea3ff94451ccd7a57c999eca3bc979, el c\u00f3dec PSD calcula los bytes por p\u00edxel (\u2019bpp\u2019) a partir de los campos de encabezado sin procesar \u2019channels * depth\u2019, pero el b\u00fafer de p\u00edxeles se asigna bas\u00e1ndose en el formato de p\u00edxel resuelto. Para el modo LAB con \u2019channels=3, depth=16\u2019, \u2019bpp = (316+7)/8 = 6\u2019, pero el formato \u2019BPP40_CIE_LAB\u2019 asigna solo 5 bytes por p\u00edxel. Cada escritura de p\u00edxel se excede, causando un desbordamiento de b\u00fafer de pila determinista en cada fila. El commit c930284445ea3ff94451ccd7a57c999eca3bc979 contiene un parche."
    }
  ],
  "id": "CVE-2026-40493",
  "lastModified": "2026-10-26T22:10:00.163",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40493",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-20T16:11:59.642196Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-18T03:16:13.440",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HappySeaFox/sail/commit/c930284445ea3ff94451ccd7a57c999eca3bc979"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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