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CVE-2026-81028— ZLMediaKit downloadFile Root-Directory Confinement Bypass via Prefix Collision

Quick assessment

Affected
ZLMediaKit ZLMediaKit
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ZLMediaKit是中国ZLMediaKit团队开源的一个基于 C++ 11 的高级运营级流媒体服务框架。 ZLMediaKit fa347d7dbe48dfdce525d3a0fdb92e576970ef9f版本存在路径遍历漏洞，该漏洞源于downloadFile API对配置的根目录限制使用前缀比较时未考虑目录边界，可能导致路径遍历，读取受限目录之外的文件。

CVSS 4.9 · Medium EPSS 0.52% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
ZLMediaKit ZLMediaKit fa347d7dbe48dfdce525d3a0fdb92e576970ef9f affected
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I. Basic Information for CVE-2026-81028

Vulnerability Information
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Vulnerability Title
ZLMediaKit downloadFile Root-Directory Confinement Bypass via Prefix Collision
Source: CVE Program / CVE List V5
Vulnerability Description
ZLMediaKit confines the downloadFile API to a configured set of root directories with a prefix comparison that does not account for directory boundaries. The configuration loader in server/WebApi.cpp builds each root with File::absolutePath("", item, true); because the relative-path argument is empty that helper returns the value without a trailing separator. The handler then accepts a requested path when start_with(file_path, root) holds, so a sibling directory whose name merely begins with the configured root string satisfies the test and is served. The only other guard rejects a path containing two dots, which this requires none of. The equivalent confinement check for the ordinary static file server in src/Http/HttpFileManager.cpp computes its root with a non-empty second argument, which appends the separator before comparing, and so is not affected. The endpoint requires the configured API secret, so this grants no privilege beyond what that secret already implies, but it reads files outside the directory the operator confined it to, and the reference container runs the server as root.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
ZLMediaKit 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ZLMediaKit是中国ZLMediaKit团队开源的一个基于 C++ 11 的高级运营级流媒体服务框架。 ZLMediaKit fa347d7dbe48dfdce525d3a0fdb92e576970ef9f版本存在路径遍历漏洞，该漏洞源于downloadFile API对配置的根目录限制使用前缀比较时未考虑目录边界，可能导致路径遍历，读取受限目录之外的文件。
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
ZLMediaKit ZLMediaKit fa347d7dbe48dfdce525d3a0fdb92e576970ef9f -

II. Public POCs for CVE-2026-81028

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III. Intelligence Information for CVE-2026-81028

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Vendor Advisories for CVE-2026-81028 (1)

Proof of Concept for CVE-2026-81028 (1)

Vendor Pages for CVE-2026-81028 (1)

IV. Related Vulnerabilities

Same product: ZLMediaKit
Same vendor: ZLMediaKit
Same weakness: CWE-22

V. Comments for CVE-2026-81028

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