CVE-2026-43982 — Algernon: Path traversal file write via savein()
Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, uploadedFileSaveIn() in lua/upload/upload.go uses filepath.Join() with the caller-supplied directory but …
Published: 2026-05-26 · CVSS: 8.7 · CVSS 4.0
Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, uploadedFileSaveIn() in lua/upload/upload.go uses filepath.Join() with the caller-supplied directory but performs no boundary check after joining. A directory of ../../../tmp resolves cleanly to /tmp, outside the web root. This vulnerability is fixed in 1.17.6.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7