CVE-2026-73079: Sub2API: Path traversal in the Responses subpath routes lets an authenticated tenant relay requests to arbitrary upstream endpoints using pooled account credentials
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Sub2APIto a version that resolves this vulnerability.Fixed in 0.1.169
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73079?
The severity of CVE-2026-73079 is rated as high with a score of 8.5.
How do I fix CVE-2026-73079?
To fix CVE-2026-73079, upgrade Sub2API to a version later than 0.1.168 that addresses the path traversal vulnerability.
What is the impact of CVE-2026-73079?
CVE-2026-73079 allows an authenticated tenant to relay requests to arbitrary upstream endpoints, potentially compromising account credentials.
Which software versions are affected by CVE-2026-73079?
CVE-2026-73079 affects Sub2API versions from 0.1.135 to 0.1.168.
What type of vulnerability is CVE-2026-73079?
CVE-2026-73079 is classified as a Path Traversal vulnerability.