How severe is CVE-2026-54037?

CVE-2026-54037 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-54037 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54037?

CVE-2026-54037 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-54037?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-54037 have an EU (EUVD) identifier?

Yes. CVE-2026-54037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39458.

When was CVE-2026-54037 published?

CVE-2026-54037 was published on 2026-06-25 and last updated on 2026-06-29.

CVE-2026-54037

CVE-2026-54037 is a medium-severity vulnerability in Librechat with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39458
Weakness: CWE-770
Affected product: Librechat
Published: 2026-06-25
Last modified: 2026-06-29

Description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint — which is in the same file and performs the exact same expensive database operations — was not given any rate limiter. An authenticated user can bypass the CVE-2025-7105 fix by using /duplicate instead of /fork to exhaust server resources. This vulnerability is fixed in 0.8.4-rc1.

Frequently asked questions

What is CVE-2026-54037?: LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint — which is in the same file and performs the exact same expensive database operations — was not given any rate limiter. An authenticated user can bypass the CVE-2025-7105 fix by using /duplicate instead of /fork to exhaust server resources. This vulnerability is fixed in 0.8.4-rc1.
How severe is CVE-2026-54037?: CVE-2026-54037 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-54037 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54037?: CVE-2026-54037 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-54037?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-54037 have an EU (EUVD) identifier?: Yes. CVE-2026-54037 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39458.
When was CVE-2026-54037 published?: CVE-2026-54037 was published on 2026-06-25 and last updated on 2026-06-29.

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-g445-9wq6-jf3v

Affected products (1)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

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