What is the CVSS score of CVE-2026-31949?

CVE-2026-31949 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Node.js are affected by CVE-2026-31949?

Organizations using LibreChat should be aware of notable risk from CVE-2026-31949 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2026-31949?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Node.js CVE-2026-31949

EUVD-2026-12093 MEDIUM

Uncaught Exception (CWE-248)

2026-03-13 GitHub_M

Denial Of Service Node.js AI / ML Librechat Danny Avila

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

0.8.3-rc1

EUVD ID Assigned

Mar 13, 2026 - 20:00 euvd

EUVD-2026-12093

Analysis Generated

Mar 13, 2026 - 20:00 vuln.today

CVE Published

Mar 13, 2026 - 19:47 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

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.

AnalysisAI

LibreChat versions prior to 0.8.3-rc1 contain a Denial of Service vulnerability in the DELETE /api/convos endpoint where authenticated attackers can crash the Node.js server process by sending malformed requests lacking the required req.body.arg parameter. The vulnerability exploits improper destructuring without validation, causing an unhandled TypeError that bypasses Express middleware and triggers process.exit(1), resulting in complete service unavailability. No evidence of active exploitation in the wild or public POC has been identified at this time.

Technical ContextAI

LibreChat is a Node.js-based ChatGPT clone application (CPE: cpe:2.3:a:danny-avila:librechat). The vulnerability stems from CWE-248 (Uncaught Exception), a root cause class involving improper exception handling. Specifically, the DELETE /api/convos route handler performs destructuring assignment on req.body.arg without prior null/undefined validation. When a malformed request omits this parameter, JavaScript throws a TypeError during destructuring, which is not caught by the route handler or Express error middleware, causing the entire Node.js process to terminate. This indicates a lack of defensive programming practices and insufficient input validation at the route handler level before object destructuring operations.

RemediationAI

Immediate patch: Upgrade LibreChat to version 0.8.3-rc1 or later once released as stable. For users unable to patch immediately: (1) Implement network-level access controls restricting who can authenticate to LibreChat instances (e.g., VPN, allowlisting); (2) Deploy a reverse proxy (nginx, HAProxy) with request body validation rules that reject requests to DELETE /api/convos lacking the 'arg' parameter; (3) Monitor Node.js process logs for unexpected exits and implement auto-restart policies (systemd, PM2, Docker restart policies) to reduce downtime impact; (4) Implement rate limiting on authenticated users to slow attack velocity. Code-level workaround (if patching is delayed): Add input validation middleware before the DELETE /api/convos handler to validate req.body.arg existence and type before destructuring.