CVE-2026-40303

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, endpoints.GetSessionCookie parses an attacker-supplied cookie chunk count and calls make([]string, count) with no upper bound before any token validation occurs. The function is reached on every request to an OAuth-protected proxy share, allowing an unauthenticated remote attacker to trigger gigabyte-scale heap allocations per request, leading to process-level OOM termination or repeated goroutine panics. Both publicProxy and dynamicProxy are affected. Version 2.0.1 patches the issue.

• CWE-400
• CWE-789

• https://github.com/openziti/zrok/releases/tag/v2.0.1Release Notes
• https://github.com/openziti/zrok/security/advisories/GHSA-cpf9-ph2j-ccr9Vendor Advisory

Published

Apr 17, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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