HighVulnerabilityLLM-specific

CVE-2026-73079: Sub2API path traversal in /responses wildcard routes exposes upstream

Source: NVD(opens in a new tab)
Identifier: CVE-2026-73079
Published: August 11, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.4%

Summary

Sub2API, an AI API gateway platform, has a path traversal flaw in the POST /responses/*subpath wildcard routes, affecting versions 0.1.135 through 0.1.168. The client-supplied subpath is spliced into the upstream URL without validation, letting an authenticated tenant send requests to arbitrary upstream endpoints using the operator's pooled provider credentials, such as ChatGPT/Codex OAuth or OpenAI platform keys.

Mitigation

Fixed in 0.1.169.

Details

Scores and exploitation

CVSS score: 8.5(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Attack vector: network
Attack complexity: low
Privileges required: low
User interaction: none
EPSS: 0.4%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 10, 2026.
Disclosure date: August 11, 2026

Weaknesses and techniques

Weakness (CWE): CWE-22
CWE-441
Attack pattern (CAPEC): CAPEC-126

Affected

Vendors: OpenAI

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: API
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-73079

First tracked: August 11, 2026 at 02:09 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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