CVE-2026-40492— SAIL has heap buffer overflow in XWD decoder — bits_per_pixel vs pixmap_depth type confusion in byte-swap
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-40492
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
SAIL has heap buffer overflow in XWD decoder — bits_per_pixel vs pixmap_depth type confusion in byte-swap
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 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02, the XWD codec resolves pixel format based on `pixmap_depth` but the byte-swap code uses `bits_per_pixel` independently. When `pixmap_depth=8` (BPP8_INDEXED, 1 byte/pixel buffer) but `bits_per_pixel=32`, the byte-swap loop accesses memory as `uint32_t*`, reading/writing 4x the allocated buffer size. This is a different vulnerability from the previously reported GHSA-3g38-x2pj-mv55 (CVE-2026-27168), which addressed `bytes_per_line` validation. Commit 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02 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XWD编解码器中像素格式解析和字节交换代码不一致，可能导致越界内存访问。
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)
Shenlong Deep Dive — AI Deep Analysis
10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| HappySeaFox | sail | < 36aa5c7ec8a2bb35f6fb867a1177a6f141156b02 | - |
II. Public POCs for CVE-2026-40492
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-40492
请登录查看更多情报信息。
Same Patch Batch · HappySeaFox · 2026-04-18 · 3 CVEs total
| CVE-2026-40493 | 9.8 CRITICAL | SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode |
| CVE-2026-40494 | 9.8 CRITICAL | SAIL has heap buffer overflow in TGA RLE decoder — raw packet path missing bounds check |
IV. Related Vulnerabilities
V. Comments for CVE-2026-40492
No comments yet