CVE-2026-52792: Algernon vulnerable to server-side script source disclosure on Windows via NTFS filename

July 2, 2026

Algernon selects its file handler from filepath.Ext() (engine/handlers.go:134), which does not treat the NTFS-equivalent names x.lua::$DATA, x.lua., or x.lua as .lua. On Windows, an unauthenticated client appends one of these suffixes to any server-side script on a public path and receives its raw source instead of executed output, leaking embedded secrets such as database credentials and the SetCookieSecret value.

Linux and macOS hosts are unaffected.

References

github.com/advisories/GHSA-mm6c-5j6x-hq8m
github.com/xyproto/algernon/security/advisories/GHSA-mm6c-5j6x-hq8m
nvd.nist.gov/vuln/detail/CVE-2026-52792

Code Behaviors & Features

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