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CVE-2026-54024— LibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing File Size Limits

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-54024

Vulnerability Information
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Vulnerability Title
LibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing File Size Limits
Source: NVD (National Vulnerability Database)
Vulnerability Description
LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2024-11171 (commit bb58a2d0) added limits: { fileSize } to createMulterInstance() in the file upload routes. However, the POST /api/convos/import endpoint uses a separate multer instance that was never updated with the same limits configuration. Combined with the application-level size check being disabled by default (the CONVERSATION_IMPORT_MAX_FILE_SIZE_BYTES env var is commented out in .env.example), an authenticated user can upload arbitrarily large files to exhaust server disk space and memory. This vulnerability is fixed in 0.8.4-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
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
danny-avilaLibreChat < 0.8.4-rc1 -

II. Public POCs for CVE-2026-54024

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III. Intelligence Information for CVE-2026-54024

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Other References for CVE-2026-54024 (1)

Same Patch Batch · danny-avila · 2026-06-25 · 9 CVEs total

CVE-2026-540308.0 HIGHLibreChat: Missing Resource Parameter Validation in MCP OAuth Flow
CVE-2026-540337.7 HIGHLibreChat: SSRF via User-Provided Custom Endpoint baseURL — no private IP validation on us
CVE-2026-540276.5 MEDIUMLibreChat: Image Upload Route Bypasses Agent Permission Check — Incomplete Fix for File Up
CVE-2026-540376.5 MEDIUMLibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Ap
CVE-2026-540405.9 MEDIUMLibreChat: 2FA Backup Code Regeneration Without OTP Verification Allows 2FA Bypass
CVE-2026-540255.4 MEDIUMLibreChat: Stored XSS via unescaped image alt text in markdown artifact preview
CVE-2026-540365.3 MEDIUMLibreChat: 2FA Re-enrollment Allows Full Account 2FA Takeover Without OTP Verification
CVE-2026-540295.3 MEDIUMLibreChat: IDOR in Message Deletion — Incomplete Fix for CVE-2024-41703 Leaves deleteMessa

IV. Related Vulnerabilities

Same product: LibreChat
Same vendor: danny-avila
Same weakness: CWE-770

V. Comments for CVE-2026-54024

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