EUVD-2026-39458Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Network endpoint exploitable by any authenticated user (PR:L, AV:N, AC:L); impact is purely availability exhaustion with no confidentiality or integrity effect.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Rate limiter bypass in LibreChat prior to 0.8.4-rc1 allows any authenticated user to exhaust server resources via the POST /api/convos/duplicate endpoint, which performs identical expensive database operations as /api/convos/fork but was inadvertently omitted from the CVE-2025-7105 remediation scope. Operators who applied the prior fix may believe resource exhaustion was fully mitigated - they remain exposed through this overlooked parallel endpoint. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated user session on the target LibreChat instance (PR:L per CVSS vector) - unauthenticated exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) accurately reflects the risk profile: the attack is network-accessible, requires low complexity, demands only a low-privileged (authenticated) account, and yields full availability impact with no confidentiality or integrity consequence. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user on a public or shared LibreChat instance - including a self-registered account - sends a high-frequency loop of POST requests to /api/convos/duplicate using standard HTTP tooling such as curl or a simple script. Each request triggers expensive database duplication operations with no server-side throttling, rapidly consuming database connection pool capacity, CPU, or memory. … |
| Remediation | The primary fix is to upgrade LibreChat to version 0.8.4-rc1 or later, which applies rate limiting to POST /api/convos/duplicate consistent with the controls already in place on /fork. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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