SFTPGo has path confinement bypass in public browsable share partial ZIP download

中 5.9CVE-2026-49244 · GHSA-h64p-8h4r-6gfh · GO-2026-5902 · 20/08/2026 公開 · 18/10/2026 更新

要点

CVE-2026-49244 は github.com/drakkan/sftpgo, github.com/drakkan/sftpgo/v2 に影響する深刻度「中」 (CVSS 5.9) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.45%（全脆弱性の 38.9% より高い）。
対処：2.7.3 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
github.com/drakkan/sftpgo Go	`全バージョン`	修正版なし
github.com/drakkan/sftpgo/v2 Go	`≥ 2.2.0, < 2.7.3`	`2.7.3`

概要

Summary

The public web-client endpoint for partial ZIP downloads of a browsable share did not correctly confine the client-supplied files entries to the shared directory. A requester able to reach a public share could read files located outside the shared directory, as long as the target's canonical path begins with the shared directory's name.

Patches

Fixed in v2.7.3. The fix replaces the raw prefix check with a directory-boundary–aware check.

NVD の説明

SFTPGo is an open source, event-driven file transfer solution. From 2.2.0 until 2.7.3, the public web-client partial ZIP download endpoint for a browsable share validates client-supplied files entries with a raw byte-prefix comparison rather than a directory-boundary-aware check. An unauthenticated requester who can reach a public share can select a canonical path outside the shared directory when the target path begins with the shared directory's name, such as a sibling path that shares the same prefix. The endpoint then includes the out-of-scope file in the generated download, disclosing its contents. This issue is fixed in version 2.7.3.