CVE-2026-73079CWE-22CWE-441path-traversal

CVE-2026-73079

High · published August 11, 2026

CVSS v3.1
8.5
EPSS
0%
Percentile
31.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00388 · 31.7th percentile
Weaknesses
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'); CWE-441 · Unintended Proxy or Intermediary ('Confused Deputy')
Published
2026-08-11T20:17Z
References (4)
https://github.com/Wei-Shaw/sub2api/commit/017f6bbd5edffea0639ef3c84c0391161983f1f3 · [email protected]https://github.com/Wei-Shaw/sub2api/pull/5137 · [email protected]https://github.com/Wei-Shaw/sub2api/releases/tag/v0.1.169 · [email protected]https://github.com/Wei-Shaw/sub2api/security/advisories/GHSA-vrxq-qm4h-6hgg · [email protected]
EPSS history
Timeline
  • 11 AUG 15:54Z
    Sub2API: Path traversal in the Responses subpath routes lets an authenticated tenant relay requests to arbitrary upstream endpoints using pooled account credentials
    cvelistv5