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TI-2026-24491 Aliases CVE-2026-31945

LibreChat Server-Side Request Forgery using DNS resolution

Priority HIGH 67CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

LibreChat is a ChatGPT clone with additional features. Versions 0.8.2-rc2 through 0.8.2 are vulnerable to a server-side request forgery (SSRF) attack when using agent actions or MCP. Although a previous SSRF vulnerability (https://github.com/danny-avila/LibreChat/security/advisories/GHSA-rgjq-4q58-m3q8) was reported and patched, the fix only introduced hostname validation. It does not verify whether DNS resolution results in a private IP address. As a result, an attacker can still bypass the protection and gain access to internal resources, such as an internal RAG API or cloud instance metadata endpoints. Version 0.8.3-rc1 contains a patch.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00259 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed LibreChat (danny-avila): 0.8.3-rc1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
danny-avilaLibreChat0.8.2-rc2 to before 0.8.3-rc10.8.3-rc1Patch availableCNA
  • LibreChat Vendordanny-avila Affected 0.8.2-rc2 to before 0.8.3-rc1 Fixed in 0.8.3-rc1 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*0.8.2Vulnerabledanny-avila
cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*0.8.2 rc2Vulnerabledanny-avila
cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*0.8.2 rc3Vulnerabledanny-avila
  • cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:* Versions 0.8.2 Vulnerable ·danny-avila
  • cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:* Versions 0.8.2 rc2 Vulnerable ·danny-avila
  • cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:* Versions 0.8.2 rc3 Vulnerable ·danny-avila

Remediation

  • Fix · CNA LibreChat (danny-avila) Fixed in 0.8.3-rc1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31945

References

Exploit 1

  • TI-2026-25134 LibreChat Exfiltrates Server Secrets via MCP Server URL Injection CVSS 3.1CRITICAL 9.6
  • TI-2026-17862 LibreChat MCP Stdio Remote Command Execution CVSS 3.1CRITICAL 9.9
  • TI-2026-38976 LibreChat: Missing Resource Parameter Validation in MCP OAuth Flow CVSS 3.1CRITICAL 9.3
  • TI-2024-27763 LibreChat through 0.7.4-rc1 has incorrect access control for message updates. CVSS 3.1CRITICAL 9.8
  • TI-2024-10347 Path Traversal in danny-avila/librechat CVSS 3.0HIGH 8.8
  • TI-2026-25682 In LibreChat 0.8.1-rc2, a logged-in user obtains a JWT for both the LibreChat API and the RAG API. CVSS 3.1CRITICAL 9.0
See all 50 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences