What is CVE-2026-4276?

CVE-2026-4276 is a high-severity vulnerability in Librechat, classified under Code Injection. CVSS score: 7.5/10. Published 2026-03-16.

How severe is CVE-2026-4276?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Librechat

CVE-2026-4276

LibreChat RAG API, version 0.7.0, contains a log-injection vulnerability that allows attackers to forge log entries.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (39.7th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Librechat — versions 0.7.0
Librechat Rag API — versions 0.7.0

Weakness classification (CWE)

CWE-94 — Code Injection

References

kb.cert.org/vuls/id/624941 (VDB Entry, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2026-4276?: CVE-2026-4276 is a high-severity vulnerability in Librechat, classified under Code Injection. CVSS score: 7.5/10. Published 2026-03-16.
How severe is CVE-2026-4276?: High severity. CVSS v3 base score is 7.5 out of 10.