CVE-2026-40931— Complete Bypass of CVE-2026-24884 Patch via Git-Delivered Symlink Poisoning in compressing
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I. Basic Information for CVE-2026-40931
Vulnerability Information
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Vulnerability Title
Complete Bypass of CVE-2026-24884 Patch via Git-Delivered Symlink Poisoning in compressing
Source: NVD (National Vulnerability Database)
Vulnerability Description
Compressing is a compressing and uncompressing lib for node. Prior to 2.1.1 and 1.10.5, the patch for CVE-2026-24884 relies on a purely logical string validation within the isPathWithinParent utility. This check verifies if a resolved path string starts with the destination directory string but fails to account for the actual filesystem state. By exploiting this "Logical vs. Physical" divergence, an attacker can bypass the security check using a Directory Poisoning technique (pre-existing symbolic links). This vulnerability is fixed in 2.1.1 and 1.10.5.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: NVD (National Vulnerability Database)
Vulnerability Title
compressing 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
compressing是node_modules开源的一个压缩和解压缩工具库。 compressing 2.1.1之前版本和1.10.5之前版本存在后置链接漏洞，该漏洞源于isPathWithinParent工具中的纯逻辑字符串验证存在缺陷，无法考虑实际文件系统状态，可能导致攻击者利用目录投毒技术绕过安全检查。
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)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| node-modules | compressing | >=2.0.0, < 2.1.1 | - |
II. Public POCs for CVE-2026-40931
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-59
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Improper Authentication in TUBITAK BILGEM's Pardus About - CVE-2026-41397
OpenClaw < 2026.3.31 - Sandbox Escape via Unrestricted File
V. Comments for CVE-2026-40931
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