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Organizations running LiteLLM versions older than 1.83.9 should patch immediately. Two high-risk flaws disclosed by Check Point Research on October 13, 2026, can let a low-privilege account alter gateway configuration, expose provider credentials, and potentially lead to remote code execution.
What happened
Check Point Research assessed LiteLLM 1.77.7 and found two vulnerabilities in the open-source SDK and gateway. LiteLLM commonly sits between applications and multiple large-language-model providers, centralizing provider credentials, routing, permissions, configuration, usage records and cost tracking. The issues are fixed in LiteLLM 1.83.9 and later.
Check Point reported 97 million LiteLLM downloads per month and more than 59,000 GitHub stars in 2026. Those figures indicate substantial adoption, but the published sources do not establish how many organizations were compromised or how many deployments remain vulnerable.
“In practical terms, anyone holding an account on a vulnerable LiteLLM deployment could take over the gateway and use it for malicious purposes.” — Check Point Research, 2026
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The two vulnerabilities
| CVE | Attack path | Potential impact | Fixed version |
|---|---|---|---|
| CVE-2026-35029 | The /config/update endpoint lacked a required role check, while permissive prefix matching affected UI routes. |
Authenticated low-privilege users could modify proxy configuration, read arbitrary files, take over administrator accounts and reach remote code execution through externally loaded Python modules. | LiteLLM 1.83.9 and later |
| CVE-2026-59823 | The user_config path allowed a user to select an attacker-controlled API base for LiteLLM requests. |
The gateway could forward provider authentication keys to the attacker-controlled destination, exposing credentials and enabling unauthorized, billable provider use. | LiteLLM 1.83.9 and later |
CVE-2026-35029: authorization bypass
LiteLLM’s configuration endpoint could be reached without the role enforcement administrators expected. Combined with the UI route-matching weakness, this gave an authenticated account with limited privileges a path to change proxy settings. Check Point demonstrated a chain involving arbitrary file access, administrator-account takeover and remote code execution through Python modules loaded from an external location.
CVE-2026-59823: SSRF and credential exposure
The second flaw concerns server-side request forgery. By controlling the user_config route, a user could direct the gateway to send requests to an infrastructure endpoint chosen by the attacker. Because LiteLLM may attach provider authentication keys when forwarding requests, those secrets could leave the organization. An attacker could then use the keys against the provider, creating unauthorized charges or consuming quotas.
“This security assessment of LiteLLM revealed multiple high-risk vulnerabilities that could be chained together to achieve remote code execution, arbitrary file access, and complete system compromise.” — Check Point Research, 2026
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Why a gateway compromise has broad consequences
A gateway compromise is not limited to one application or model account. LiteLLM can hold credentials for several providers, decide which users may call them, route prompts and responses, and record usage and spending. An attacker who gains control may therefore reach multiple AI accounts and any internal systems accessible from the gateway host.
Internet-facing deployments deserve immediate priority, but an internal-only gateway is not automatically safe: any compromised employee account, service account or connected platform may provide the initial authenticated access.
Is my organization affected?
Treat every LiteLLM deployment earlier than 1.83.9 as potentially affected until it is upgraded and checked. Include instances that are embedded in internal platforms, developer tools and AI-building products, because they may not appear in an inventory as a separately managed LiteLLM service.
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- Identify the exact LiteLLM version for every container, virtual environment, package lockfile and managed deployment.
- Locate internet-facing gateways and record which provider keys, databases and internal networks they can reach.
- Check whether ordinary user accounts can access configuration functions or create custom request destinations.
- Review gateway and provider logs for unexpected configuration changes, unusual outbound destinations, new administrator accounts, file-access errors or unexplained usage.
Immediate response checklist
- Upgrade all deployments. Move each LiteLLM instance to 1.83.9 or a later release, then verify the running version rather than relying only on a build file or image tag.
- Inventory direct and embedded instances. Search application repositories, container images, orchestration manifests and internal AI platforms for LiteLLM components, including gateways not exposed publicly.
- Reduce account access. Review gateway accounts, remove dormant users and eliminate unnecessary administrative or configuration privileges.
- Rotate provider credentials when exposure cannot be ruled out. Revoke or disable the existing key in the provider’s control panel, create a replacement with the minimum required scope, update the gateway’s secret store, redeploy or restart the affected service, and confirm that the old key no longer works. Repeat for every provider key the gateway could access.
- Test effective permissions. Use a low-privilege test account to attempt configuration actions and custom API destinations. A role that is correctly configured on paper is not proof that enforcement works in the deployed version.
- Preserve evidence and investigate. Retain gateway, identity, cloud and provider-usage logs before making broad changes. Look for access predating the patch, then involve incident-response personnel if account takeover, credential use or code execution is suspected.
Hardening after the upgrade
Constrain the gateway’s network
Use outbound firewall or egress controls so the gateway can reach only approved model-provider endpoints and required internal services. Blocking arbitrary destinations reduces the damage from request-forwarding flaws and limits data-exfiltration paths.
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Keep provider keys in a dedicated secret-management system rather than source code or broadly readable configuration files. Give each application or team a separate, narrowly scoped credential where providers support it, and monitor key use and spending.
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Strengthen identity and authorization
Require strong authentication for gateway accounts, separate operational and configuration roles, remove unused accounts promptly and review permission changes. Include negative tests that prove a normal user cannot reach administrative endpoints.
Monitor and test AI infrastructure
Alert on configuration changes, new administrator accounts, unusual destinations, sudden usage increases and provider-key failures. Add LLM gateways to penetration tests and vulnerability assessments alongside web applications and cloud infrastructure, rather than treating them as ordinary libraries with no externally reachable attack surface.
What the disclosure does not establish
The public findings identify the affected versions and demonstrated attack chains, but they do not provide an independent victim count or a measured prevalence rate across all LiteLLM installations. The 97-million-download figure is Check Point’s 2026 adoption estimate, not a count of active organizations or exposed gateways. Each organization must determine exposure from its own deployment inventory, logs and provider-account records.
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