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CVE-2026-68548 – Algernon: Case-insensitive filesystem lets unauthenticated requests bypass /admin,/repo,/data permission-prefix gate

Posted on November 13, 2026
CVE ID :CVE-2026-68548

Published : Nov. 12, 2026, 8:18 p.m. | 2 hours, 57 minutes ago

Description :Algernon is a small self-contained pure-Go web server. Prior to version 1.17.10, Algernon’s URL-prefix authorization gate matches its protected prefixes (/admin, /repo, /data) with case-sensitive strings.HasPrefix, while the exact same raw req.URL.Path is later resolved against the filesystem. On case-insensitive filesystems (Windows NTFS — always; macOS APFS/HFS+ — default), a request for /Admin/secret.lua evades every protected-prefix check, falls through to the public-prefix accept branch, and then resolves on disk to admin/secret.lua. The result is an unauthenticated bypass of the /admin, /repo, and /data authorization boundary, enabling read (and, for Lua files, execution) of protected content. The permission system is active in the default configuration. This issue has been patched in version 1.17.10.

Severity: 9.4 | CRITICAL

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