CVE-2026-73079
HighCVSS 8.5Summary
Sub2API, an AI API gateway platform, versions 0.1.135 to 0.1.168 have a vulnerability where tenant API keys are exchanged for upstream requests made with shared provider accounts (ChatGPT/Codex OAuth, OpenAI platform keys, or an operator-configured base URL) that belong to the operator. The `POST /responses/*subpath` wildcard routes splice the client-supplied subpath into the upstream URL with no validation, allowing an authenticated tenant to relay requests to arbitrary upstream endpoints using pooled account credentials via path traversal. The vulnerability is fixed in 0.1.169.
Risk Assessment
An authenticated tenant can access unauthorized resources or perform operations on provider accounts, potentially leading to data breaches and abuse. Authentication is required, but the risk is serious.
Recommendation
Immediately update Sub2API to version 0.1.169 or later. Also review logs for unusual requests.
Original NVD description (English source)
Sub2API is an AI API gateway platform designed to distribute and manage API quotas from AI product subscriptions. From 0.1.135, to 0.1.168, platform API keys issued to tenants are exchanged for upstream requests made with shared provider accounts (ChatGPT/Codex OAuth, OpenAI platform keys, or an operator-configured base URL) that belong to the operator, not to the caller. The `POST /responses/*subpath` wildcard routes spliced the client-supplied subpath into the upstream URL with no validation. This lets an authenticated tenant relay requests to arbitrary upstream endpoints using pooled account credentials via a path traversal. This vulnerability is fixed in 0.1.169.