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

State: Published
Severity: 8.5 High
Published: Aug 11, 2026
Updated: Aug 11, 2026
Reserved: Aug 10, 2026

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Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.5 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')

Affected Products

Product	Versions
sub2apiWei-Shaw	>= 0.1.135, <0.1.169Affected

References

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