CVE-2026-73079

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.

CVSS 3.1

8.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-25)

CWEs

CWE-22, CWE-441

Published

2026-08-11

Modified

2026-10-24

Record from

the NVD, synced 2026-10-24

References

• https://github.com/Wei-Shaw/sub2api/commit/017f6bbd5edffea0639ef3c84c0391161983f1f3
• https://github.com/Wei-Shaw/sub2api/pull/5137
• https://github.com/Wei-Shaw/sub2api/releases/tag/v0.1.169
• https://github.com/Wei-Shaw/sub2api/security/advisories/GHSA-vrxq-qm4h-6hgg

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