🛡️ CVE-2026-48099 — wsgidav

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-22 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

WsgiDAV encoded dot segments can escape filesystem share roots

Impact

WsgiDAV 4.3.3 can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout.

Patches

The issue is fixed with version 4.3.4.

Preconditions

The practical impact depends on the deployment.

The deployment uses a filesystem-backed WsgiDAV share.

The attacker can send WebDAV requests accepted by that share. This may be an anonymous share or an authenticated WebDAV user. This is not an authentication bypass.

Details

The issue is in FilesystemProvider._loc_to_file_path(). The method builds a candidate path with os.path.abspath(os.path.join(root_path, *path_parts)), then checks containment with file_path.startswith(root_path). This is not path-boundary aware. For example, if the configured share root is /tmp/share, a resolved sibling path such as /tmp/share_evil/secret.txt still starts with the string /tmp/share.

In a local proof, this allowed GET, PUT, and DELETE requests to operate on files outside the configured share root.

The WSGI/server layer forwards the encoded dot segment to WsgiDAV's PATH_INFO. The local proof used /%2e%2e/..., which wsgiref passed through as /../....

A sibling or neighboring path exists whose absolute path starts with the configured root path string, such as /tmp/share and /tmp/share_evil.

The WsgiDAV process has OS permissions for the outside path.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Weakness class

CVE-2026-48099 is classified as CWE-22: Path Traversal. A file path built from user input is not confined to the intended directory, letting an attacker reach files elsewhere on the filesystem.

Affected software

CVE-2026-48099 is recorded against 1 package.

  • wsgidav (fixed in 4.3.4)

Timeline and source

Published on 11 June 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
CWE CWE-22
Public Exploit ✅ No
Source OSV
Published 2026-06-11
Updated 2026-08-12
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
wsgidav — 4.3.4

Similar Threats

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