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.
Related Weaknesses (CWE)
References
- https://github.com/xyproto/algernon/commit/a6b0724928a0c35a29640b18ad5bd547f5e2e
- https://github.com/xyproto/algernon/releases/tag/v1.17.9
- https://github.com/xyproto/algernon/security/advisories/GHSA-mm6c-5j6x-hq8m
- https://github.com/xyproto/algernon/security/advisories/GHSA-mm6c-5j6x-hq8m
FAQ
What is CVE-2026-52792?
CVE-2026-52792 is a documented vulnerability. 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-equivale...
How severe is CVE-2026-52792?
CVSS scoring is not yet available for CVE-2026-52792. Check NVD for updates.
Is there a patch for CVE-2026-52792?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.