CVE-2026-42275 zrok: WebDAV drive backend follows symlinks outside DriveRoot, enabling host filesystem read/write
Remote attackers can read or write arbitrary host files via symlink following in the zrok WebDAV backend, bypassing DriveRoot restrictions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42275?
CVE-2026-42275 is a high-severity path traversal vulnerability in openziti zrok, published on 8 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
zrok is software for sharing web services, files, and network resources. Prior to version 2.0.2, the zrok WebDAV drive backend (davServer.Dir) restricts path traversal through lexical normalization but does not prevent symlink following. When a symbolic link inside the shared DriveRoot points to a location outside that root, remote WebDAV consumers can read files and—on shares without OS-level permission restrictions—write or overwrite files anywhere on the host filesystem accessible to the zrok process. This issue has been patched in version 2.0.2.
Which versions are affected by CVE-2026-42275?
6 open source packages ship an affected version, including github.com/openziti/zrok and github.com/openziti/zrok/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/openziti/zrok Go | All versions | None |
github.com/openziti/zrok Go | All versions to 1.1.11 | None |
github.com/openziti/zrok Go | All versions to 1.1.11 | None |
github.com/openziti/zrok/v2 Go | All versions | 2.0.2 |
github.com/openziti/zrok/v2 Go | All versions | 2.0.2 |
github.com/openziti/zrok/v2 Go | All versions | 2.0.2 |
Products include Netfoundry Zrok.
How do I fix CVE-2026-42275?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-42275 being exploited?
There is no known exploitation of CVE-2026-42275 in the wild and no public exploit code.
Other vulnerabilities in openziti zrok
- CVE-2026-45568 zrok Python ProxyShare can be used as an SSRF proxy through absolute URL paths
- CVE-2026-45576 zrok copy writes attacker-controlled WebDAV paths outside the destination root
- CVE-2026-40303 zrok allows unauthenticated DoS via unbounded memory allocation in striped session cookie parsing
- CVE-2026-40302 zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering
- CVE-2026-40304 zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records
Sources
Also known as GHSA-74m3-9qvm-rp9h, GO-2026-5203.