SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode_CVE-2026-40493

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-04-18T01:41:14.664Z",
    "modified": "2026-04-18T01:41:14.664Z",
    "type": "cve",
    "title": "SAIL has heap buffer overflow in PSD decoder \u2014 bpp mismatch in LAB 16-bit mode",
    "source": "GitHub_M",
    "references": "https://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv\nhttps://github.com/HappySeaFox/sail/commit/c930284445ea3ff94451ccd7a57c999eca3bc979",
    "id": "CVE-2026-40493",
    "bulletinFamily": "",
    "cwe": [
        "CWE-787"
    ],
    "cvelist": null,
    "sourceData": "HappySeaFox sail < c930284445ea3ff94451ccd7a57c999eca3bc979",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "sail",
    "version": "< c930284445ea3ff94451ccd7a57c999eca3bc979",
    "vendor": "HappySeaFox",
    "ai_description": "Heap buffer overflow in PSD decoder due to bpp mismatch in LAB 16-bit mode",
    "ai_severity": "Critical",
    "ai_vendor": "HappySeaFox",
    "ai_product": "SAIL",
    "ai_version": "< c930284445ea3ff94451ccd7a57c999eca3bc979",
    "ai_score": 9.8
}