What is CVE-2026-31951?

CVE-2026-31951 is a medium-severity vulnerability in Danny-avila Librechat, classified under Information Disclosure. CVSS score: 6.8/10. Published 2026-03-27.

How severe is CVE-2026-31951?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Information disclosure in Danny-avila Librechat

CVE-2026-31951

LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc1 through 0.8.3-rc1, user-created MCP (Model Context Protocol) servers can include arbitrary HTTP headers that undergo credential placeholder substitution. An attac…

Vulnerability class: Information Disclosure

EPSS: 0.000 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N.

Affected products

Danny-avila Librechat — versions >= v0.8.2-rc1, <= v0.8.3-rc1

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-pmw7-gqwj-f954 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-31951?: CVE-2026-31951 is a medium-severity vulnerability in Danny-avila Librechat, classified under Information Disclosure. CVSS score: 6.8/10. Published 2026-03-27.
How severe is CVE-2026-31951?: Medium severity. CVSS v3 base score is 6.8 out of 10.