CVE-2026-48099 WsgiDAV encoded dot segments can escape filesystem share roots
Attackers can escape the configured filesystem share root via encoded dot segments in WebDAV requests, potentially reading or modifying unauthorized files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48099?
CVE-2026-48099 is a high-severity path traversal vulnerability in mar10 wsgidav, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
WsgiDAV is a generic and extendable WebDAV server based on WSGI. WsgiDAV 4.3.3 and prior can allow a WebDAV request path containing an encoded parent-directory segment to escape the configured filesystem share root in a specific path layout. The issue is fixed with version 4.3.4.
Weakness: CWE-22
Which versions are affected by CVE-2026-48099?
3 open source packages ship an affected version, including wsgidav.
| Package | Affected | Fixed in |
|---|---|---|
wsgidav PyPI | All versions | 4.3.4 |
wsgidav PyPI | All versions | 4.3.4 |
wsgidav PyPI | All versions | 4.3.4 |
How do I fix CVE-2026-48099?
Upgrade wsgidav to 4.3.4 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-48099 being exploited?
There is no known exploitation of CVE-2026-48099 in the wild and no public exploit code.
Sources
Also known as GHSA-wxq4-cc2q-338q, PYSEC-2026-3428.