CVE-2026-42339 New API: SSRF Filter Bypass via 0.0.0.0

High 7.1 Published 8 May 2026 Updated 11 May 2026

Exploited in the wild: Not known
Fix: Available

What is CVE-2026-42339?

CVE-2026-42339 is a high-severity vulnerability in QuantumNous new-api, published on 8 May 2026.

Official description

New API is a large language mode (LLM) gateway and artificial intelligence (AI) asset management system. In versions 0.11.9-alpha.1 and prior, the SSRF protection introduced in v0.9.0.5 (CVE-2025-59146) and hardened in v0.9.6 (CVE-2025-62155) does not block the unspecified address 0.0.0.0. A regular (non-admin) user holding any valid API token can send a multimodal request to /v1/chat/completions, /v1/responses, or /v1/messages with 0.0.0.0 as the image/file URL host, bypassing the private-IP filter and causing the server to issue HTTP requests to localhost. This constitutes at minimum a blind SSRF; when the request is routed through an AWS/Bedrock Claude adaptor, the fetched content is inlined into the model response, upgrading it to a full-read SSRF. At time of publication, there are no publicly available patches.

Weakness: CWE-918

Which versions are affected by CVE-2026-42339?

3 open source packages ship an affected version, including github.com/QuantumNous/new-api. It affects 1 product.

Package	Affected	Fixed in
`github.com/QuantumNous/new-api` Go	All versions	None
`github.com/QuantumNous/new-api` Go	All versions to `0.11.9-alpha.1`	None
`github.com/QuantumNous/new-api` Go	All versions to `0.11.9-alpha.1`	None

Products include Newapi New Api.

How do I fix CVE-2026-42339?

Upgrade to a fixed version.

Is CVE-2026-42339 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42339 exists.

Sources

Also known as GHSA-v5c3-6wvc-pc2q, GO-2026-5652.