CVE-2026-31949— LibreChat Denial of Service (DoS) via Unhandled Exception in DELETE /api/convos
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I. Basic Information for CVE-2026-31949
Vulnerability Information
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Vulnerability Title
LibreChat Denial of Service (DoS) via Unhandled Exception in DELETE /api/convos
Source: NVD (National Vulnerability Database)
Vulnerability Description
LibreChat is a ChatGPT clone with additional features. Prior to 0.8.3-rc1, a Denial of Service (DoS) vulnerability exists in the DELETE /api/convos endpoint that allows an authenticated attacker to crash the Node.js server process by sending malformed requests. The DELETE /api/convos route handler attempts to destructure req.body.arg without validating that it exists. The server crashes due to an unhandled TypeError that bypasses Express error handling middleware and triggers process.exit(1). This vulnerability is fixed in 0.8.3-rc1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未捕获的异常
Source: NVD (National Vulnerability Database)
Vulnerability Title
LibreChat 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreChat是LibreChat开源的一个免费、高度可定制的统一 AI 对话平台，能够在一个界面中聚合并运行来自任意厂商的大模型。 LibreChat 0.8.3-rc1之前版本存在安全漏洞，该漏洞源于DELETE /api/convos端点未验证req.body.arg是否存在，可能导致经过身份验证的攻击者通过发送畸形请求使Node.js服务器进程崩溃。
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 |
|---|---|---|---|---|
| danny-avila | LibreChat | < 0.8.3-rc1 | - |
II. Public POCs for CVE-2026-31949
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IV. Related Vulnerabilities
Same product: LibreChat
- CVE-2026-34371
LibreChat Affected by Arbitrary File Write via `execute_code - CVE-2026-31951
LibreChat's MCP Server Header Injection Enables OAuth Token - CVE-2026-31950
LibreChat's IDOR in SSE Stream Subscription Allows Reading O - CVE-2026-31945
LibreChat Server-Side Request Forgery using DNS resolution - CVE-2026-31943
LibreChat has SSRF protection bypass via IPv4-mapped IPv6 no
Same vendor: danny-avila
- CVE-2026-34371
LibreChat Affected by Arbitrary File Write via `execute_code - CVE-2026-31951
LibreChat's MCP Server Header Injection Enables OAuth Token - CVE-2026-31950
LibreChat's IDOR in SSE Stream Subscription Allows Reading O - CVE-2026-31945
LibreChat Server-Side Request Forgery using DNS resolution - CVE-2026-31943
LibreChat has SSRF protection bypass via IPv4-mapped IPv6 no
Same weakness: CWE-248
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ZEBRA: Denial of Service via Interrupted JSON-RPC Requests f - CVE-2026-7183
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Wasmtime segfault or unused out-of-sandbox load with `f64x2.
V. Comments for CVE-2026-31949
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