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CVE-2026-71479— New API: Integer overflow in quota billing yields negative charges (self-crediting)

Quick assessment

Affected
QuantumNous new-api
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

QuantumNous New API是QuantumNous个人开发者的一个LLM网关和AI资产管理系统。 QuantumNous New API 1.0.0-rc.18之前版本存在数字错误漏洞，该漏洞源于common/quota_math.go及相关结算路径中的转换溢出问题，用户可控制的image n、video seconds and duration、max_tokens、max_completion_tokens、maxOutputTokens、audio duration及账单表达式数量可导致

CVSS 9.1 · Critical EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
QuantumNous new-api < 1.0.0-rc.18 affected
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I. Basic Information for CVE-2026-71479

Vulnerability Information
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Vulnerability Title
New API: Integer overflow in quota billing yields negative charges (self-crediting)
Source: CVE Program / CVE List V5
Vulnerability Description
New API is a large language mode (LLM) gateway and artificial intelligence (AI) asset management system. Prior to 1.0.0-rc.18, user-controlled image n, video seconds and duration, max_tokens, max_completion_tokens, maxOutputTokens, audio duration, and billing-expression quantities can overflow conversions in common/quota_math.go and related settlement paths, allowing a low-privileged account with positive balance or an active subscription to turn a negative charge into account credit and potentially drain upstream funds. This issue is fixed in version 1.0.0-rc.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
QuantumNous New API 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QuantumNous New API是QuantumNous个人开发者的一个LLM网关和AI资产管理系统。 QuantumNous New API 1.0.0-rc.18之前版本存在数字错误漏洞，该漏洞源于common/quota_math.go及相关结算路径中的转换溢出问题，用户可控制的image n、video seconds and duration、max_tokens、max_completion_tokens、maxOutputTokens、audio duration及账单表达式数量可导致
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
QuantumNous new-api < 1.0.0-rc.18 -

II. Public POCs for CVE-2026-71479

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8336 chars
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III. Intelligence Information for CVE-2026-71479

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Patches & Fixes for CVE-2026-71479 (2)

Vendor Advisories for CVE-2026-71479 (1)

Vendor Pages for CVE-2026-71479 (1)

Same Patch Batch · QuantumNous · 2026-08-17 · 5 CVEs total

CVE-2026-64859 9.1 CRITICAL New API: User List API Leaks Root User Access Token Leading to Privilege Escalation
CVE-2026-64868 7.5 HIGH New API: Unauthenticated payment webhooks allow memory and disk DoS via unbounded body rea
CVE-2026-64865 6.0 MEDIUM New API: Redis user quota cache overwrite via PUT /api/user/self allows quota bypass
CVE-2026-64866 5.1 MEDIUM New API: Admin can reset passkeys for same-level or higher-privileged users

IV. Related Vulnerabilities

Same product: new-api
Same vendor: QuantumNous
Same weakness: CWE-190

V. Comments for CVE-2026-71479

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