CVE-2026-76844— webpack-dev-middleware 路径穿越漏洞
一分钟漏洞结论
影响对象
webpack webpack-dev-middleware
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
webpack-dev-middleware 中的 函数在通过测试遍历防护（traversal guard）后，以固定的字符偏移量对请求路径名进行切片，从而将请求解析为本地文件。该防护机制依赖于 对 的应用，它仅匹配作为独立路径段出现的 ；而包含性检查则通过字符串比较 实现，最终文件路径由 构建。 当配置的 末尾不包含斜杠时，例如针对 发起请求 ，其路径名为 。其中，唯一的 位于路径段 内部，因此能够绕过防护检测；然而，基于偏移量的切片操作会在该路径段中间截断，导致向 传入 ，从而将文件解析到 上一级目录中。 要从
可能的 ATT&CK 技术 1 AI
T1564.004 · NTFS File Attributes影响版本矩阵 4
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| webpack | webpack-dev-middleware | 5.3.4≤ 5.3.4 |
affected |
6.1.2≤ 6.1.3 |
affected | ||
7.1.0≤ 7.4.5 |
affected | ||
8.0.0≤ 8.1.1 |
affected |
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一、 漏洞 CVE-2026-76844 基础信息
漏洞信息
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Vulnerability Title
webpack-dev-middleware Path Traversal via Offset Slice on a Non-Slash-Terminated publicPath
来源: CVE Program / CVE List V5
Vulnerability Description
webpack-dev-middleware resolves a request to a local file in getFilenameFromUrl by testing the request pathname against a traversal guard and then slicing it at a fixed character offset. The guard, UP_PATH_REGEXP applied to path.normalize(`./${pathname}`), only matches ".." that stands as a whole path segment, while the containment test is the string comparison pathname.startsWith(publicPathPathname) and the file path is built as path.join(outputPath, pathname.slice(publicPathPathname.length)). When the configured publicPath has no trailing slash, a request such as GET /assets../.env against publicPath /assets yields the pathname /assets../.env, whose only dot-dot sits inside the segment "assets.." and so passes the guard, but the offset slice cuts within that segment and hands "../.env" to path.join, resolving one directory above outputPath. Reading a file from that path requires the middleware to be backed by the physical filesystem, which happens when writeToDisk is true or a custom outputFileSystem is supplied, since the default memfs volume holds only build output. Traversal depth is limited to a single directory because a separately delimited dot-dot segment is collapsed during URL parsing before the guard runs. The default publicPath value of "auto" resolves to "/" and is not affected. This is an incomplete fix for CVE-2024-29180: the guard and offset slice were introduced by that fix and are present in every release from 5.3.4, 6.1.2 and 7.1.0 onward.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
来源: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| webpack | webpack-dev-middleware | 5.3.4 ~ 5.3.4 | - |
|
二、漏洞 CVE-2026-76844 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
Qwen3.6-35B-A3B
· 7730 chars
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三、漏洞 CVE-2026-76844 的情报信息
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CVE-2026-76844 厂商安全公告 (2)
IV. Related Vulnerabilities
V. Comments for CVE-2026-76844
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