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Vulnerability record · CVE-2026-73079 · published 11 August 2026

CVE-2026-73079: Path traversal vulnerability

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.

8.5 CVSS 3.1 High EPSS 0.39% · top 69.7% CWE-22 · Path traversalCWE-441 · CWE-441 Deferred
8.5CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
9 Sep 2026Last modified by NVD

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.

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

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-73079), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.