CVE-2026-40493— SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode
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I. Basic Information for CVE-2026-40493
Vulnerability Information
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Vulnerability Title
SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
SAIL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SAIL是SAIL开源的一款图像解码库。 SAIL存在安全漏洞，该漏洞源于PSD编解码器中字节每像素计算和像素缓冲区分配不一致，可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| HappySeaFox | sail | < c930284445ea3ff94451ccd7a57c999eca3bc979 | - |
II. Public POCs for CVE-2026-40493
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · HappySeaFox · 2026-04-18 · 3 CVEs total
| CVE-2026-40494 | 9.8 CRITICAL | SAIL has heap buffer overflow in TGA RLE decoder — raw packet path missing bounds check |
| CVE-2026-40492 | 9.8 CRITICAL | SAIL has heap buffer overflow in XWD decoder — bits_per_pixel vs pixmap_depth type confusi |
IV. Related Vulnerabilities
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