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CVE-2026-64865— New API: Redis user quota cache overwrite via PUT /api/user/self allows quota bypass

Quick assessment

Affected
QuantumNous new-api
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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.16之前版本存在竞争条件问题漏洞，该漏洞源于竞争条件问题，可能导致已认证用户通过重复的PUT /api/user/self请求更新语言或sidebar_modules时覆盖并发配额扣除，使缓存配额保持虚高。

CVSS 6.0 · Medium EPSS 0.24% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
QuantumNous new-api < 1.0.0-rc.16 affected
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I. Basic Information for CVE-2026-64865

Vulnerability Information
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Vulnerability Title
New API: Redis user quota cache overwrite via PUT /api/user/self allows quota bypass
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.16, repeated PUT /api/user/self requests that update language or sidebar_modules can race relay billing because controller/user.go calls User.Update and updateUserCache performs a full RedisHSetObj write to user:.Quota, overwriting concurrent HINCRBY deductions and allowing an authenticated user to keep cached quota artificially high. This issue is fixed in version 1.0.0-rc.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
QuantumNous New API 竞争条件问题漏洞
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.16之前版本存在竞争条件问题漏洞，该漏洞源于竞争条件问题，可能导致已认证用户通过重复的PUT /api/user/self请求更新语言或sidebar_modules时覆盖并发配额扣除，使缓存配额保持虚高。
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.16 -

II. Public POCs for CVE-2026-64865

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III. Intelligence Information for CVE-2026-64865

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Vendor Advisories for CVE-2026-64865 (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-2026-71479 9.1 CRITICAL New API: Integer overflow in quota billing yields negative charges (self-crediting)
CVE-2026-64868 7.5 HIGH New API: Unauthenticated payment webhooks allow memory and disk DoS via unbounded body rea
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-362

V. Comments for CVE-2026-64865

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