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CVE-2026-52792— Algernon: Server-side script source disclosure on Windows via NTFS filename

Quick assessment

Affected
xyproto algernon
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Algernon 是一个轻量级、自包含的纯 Go 语言 Web 服务器。在 1.17.9 版本之前，Algernon 在 Windows 平台上通过调用 来选择 中的文件处理器，但未首先拒绝 NTFS 等效文件名（如 、 和 ）。未经验证身份的攻击者可以利用 、 、 、 或 等扩展名，将这些后缀附加到服务器端公开的脚本上。请求路径经过 中的 函数处理后，会跳过渲染器和执行逻辑分支，进入 、 、 和 流程；同时，NTFS 会将该别名解析为底层脚本文件。因此，服务器会返回原始脚本源码，可能导致数据库凭据、API 密钥以

CVSS 8.7 · High EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
xyproto algernon < 1.17.9 affected
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I. Basic Information for CVE-2026-52792

Vulnerability Information
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Vulnerability Title
Algernon: Server-side script source disclosure on Windows via NTFS filename
Source: CVE Program / CVE List V5
Vulnerability Description
Algernon is a small self-contained pure-Go web server. Prior to 1.17.9, Algernon on Windows selects a file handler in engine/handlers.go by calling filepath.Ext() without first rejecting NTFS-equivalent names such as x.lua::$DATA, x.lua., and x.lua . An unauthenticated client can append one of these suffixes to a public server-side script using the .lua, .tl, .po2, .amber, or .frm extension. The request path passes through URL2filename in utils/files.go, skips the renderer and execution cases, and reaches FilePage, os.Open, ReadAndLogErrors, and ToClient, while NTFS resolves the alias to the underlying script. The server consequently returns raw script source and can expose database credentials, API keys, and the SetCookieSecret value, which may permit forged session cookies. Linux and macOS hosts are not affected by this issue. This issue is fixed in version 1.17.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Windows::DATA交换数据流处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xyproto algernon < 1.17.9 -

II. Public POCs for CVE-2026-52792

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10665 chars
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III. Intelligence Information for CVE-2026-52792

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Patches & Fixes for CVE-2026-52792 (1)

Vendor Advisories for CVE-2026-52792 (1)

Vendor Pages for CVE-2026-52792 (1)

IV. Related Vulnerabilities

Same product: algernon
Same vendor: xyproto
Same weakness: CWE-69

V. Comments for CVE-2026-52792

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