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CVE-2026-123061

litellm: litellm: unauthenticated arbitrary file read leading to master key leakage and remote code execution

A critical vulnerability was discovered in LiteLLM Enterprise proxy where an unauthenticated remote attacker can trigger an arbitrary file read on any LLM route. This flaw allows an attacker to leak the proxy's master key (LITELLM_MASTER_KEY) and third-party model provider API credentials. With administrative proxy access obtained via the leaked master key, attackers can, in certain configurations, achieve remote code execution as root.

CVSS 3.1 · 9.8 Critical EPSS n/a KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-114612

LiteLLM: Privilege Escalation to Proxy Admin via Cross-Domain Reuse of the Salt Key

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From 1.87.0 until 1.100.4, 1.101.3, 1.102.2, 1.103.1, and 1.104.0-rc.2, the proxy reuses one cryptographic context for at-rest secrets and session tokens, allowing an authenticated internal user to have crafted metadata containing a forged administrator credential encrypted and returned by the API-key flow. Replaying that ciphertext as a bearer token causes the proxy to trust the forged proxy administrator identity, permitting administrative access and arbitrary commands through the MCP stdio endpoint. Versions 1.87.0 through 1.90.x require EXPERIMENTAL_UI_LOGIN to be enabled, while versions after 1.91.0 are exploitable in the default configuration. This issue was fixed in LiteLLM 1.100.4, 1.101.3, 1.102.2, 1.103.1, and 1.104.0-rc.2.

CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-108574

BerriAI LiteLLM Spend Tracking spend_management_endpoints.py ui_view_session_spend_logs authorization

A flaw has been found in BerriAI LiteLLM up to 1.95.0. Affected by this issue is the function ui_view_session_spend_logs of the file litellm/proxy/spend_tracking/spend_management_endpoints.py of the component Spend Tracking. Executing a manipulation of the argument session_id can lead to authorization bypass. It is possible to launch the attack remotely. The exploit has been published and may be used. Upgrading to version 1.96.0 can resolve this issue. This patch is called 722d9ffa4f6c5ae15702ab9ab2c5f6bf1688308b. The affected component should be upgraded.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-93355

LiteLLM Weak JWT Authentication via Email-Based User Lookup

LiteLLM contains a weak authentication vulnerability that allows an attacker holding a valid JWT from the configured identity provider to authenticate as any existing user by exploiting an email-based fallback lookup in the JWT authentication flow without verifying the email_verified claim. Attackers can present a token with an unverified email address matching a victim's account to inherit the victim's role, including proxy_admin privileges, and permanently overwrite the victim's stored identity binding to retain persistent unauthorized access to administrative endpoints exposing API keys and user management.

CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-89032

BerriAI LiteLLM < 1.101.0-rc.1 Tenant Isolation Bypass via Semantic Cache Layer

BerriAI LiteLLM before 1.101.0-rc.1 contains a tenant isolation bypass vulnerability in the semantic cache layer that allows authenticated users to read other tenants' cached responses by exploiting a metadata key mismatch between _get_semantic_cache_tenant_scope() and _get_metadata_variable_name(). Attackers holding a valid virtual key can submit semantically similar prompts on affected routes such as /v1/responses and /bedrock/* to retrieve cached responses containing other tenants' personally identifiable information, financial data, or source code, and can cause agentic front-ends to auto-execute attacker-supplied tool calls under victim credentials by returning cached function_call or tool_calls payloads to a different principal.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-59823

LiteLLM: Server-side request forgery via the `user_config` request parameter in LiteLLM Proxy

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.9, an authenticated LiteLLM Proxy caller with a valid virtual key can place api_base inside the user_config request body to bypass is_request_body_safe, which blocks top-level api_base and base_url but previously did not inspect or reject user_config. Because user_config constructs the outbound router, the nested destination redirects a server-side request to an internal or external host selected by the caller and can expose endpoints the caller cannot otherwise access. This issue is fixed in version 1.83.9.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-84377

LiteLLM: Authenticated SSRF and provider-credential exfiltration via unvalidated request-body routing parameters

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to versions 1.88.6 and 1.96.2, any authenticated LiteLLM proxy user could redirect an outbound provider call to a destination the user controls and cause the proxy to send its configured provider credentials to that destination. Request validation in litellm/proxy/auth/auth_utils.py, litellm/proxy/common_request_processing.py, litellm/proxy/health_endpoints/_health_endpoints.py, litellm/proxy/image_endpoints/endpoints.py, and litellm/proxy/litellm_pre_call_utils.py used incomplete checks that did not cover every sensitive parameter or inspect equivalent values across nested request fields, path values, and bracket-notation form data. Routing and credential parameters including api_base, base_url, model_list, fallbacks, and litellm_credential_name could therefore be applied without clearing the operator's stored key, exposing upstream provider credentials and other configured secrets and permitting server-side requests to internal services reachable by the proxy. This issue is fixed in versions 1.88.6 and 1.96.2.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-59822

LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-37004

Server‑Side Template Injection in BerriAI litellm Enables Remote Code Execution

BerriAI litellm <=1.82.4 is vulnerable to Server-Side Template Injection (SSTI), which allows unauthenticated remote attackers to execute arbitrary OS commands via a crafted dotprompt_content parameter in the /prompts/test endpoint due to use of an unsandboxed jinja2.Environment.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-30623

litellm: LiteLLM: Remote code execution via unvalidated MCP server configuration

LiteLLM 1.18.10 contains a remote code execution vulnerability in its MCP server creation functionality. The application allows users to add MCP servers via a JSON configuration specifying arbitrary command and args values. LiteLLM executes these values on the host without validation, enabling attackers to run arbitrary operating system commands. Successful exploitation may result in remote code execution with the privileges of the LiteLLM process.

CVSS 3.1 · 9.8 Critical EPSS 6.0% KEV · Not listed
Vendors
Berriai
Products
Litellm
CVE-2026-59819

LiteLLM: Local file read via request-supplied OIDC file references

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.10-stable, LiteLLM's /health/test_connection endpoint resolved request-supplied environment and OIDC file references in litellm_params, allowing a proxy administrator or another privileged caller with permission to test model connections to read files from the local filesystem via an oidc/file/ reference. This issue is fixed in version 1.83.10-stable.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-59821

LiteLLM: Custom Code Guardrails production endpoints bypass code safety checks

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.82.0-stable, LiteLLM's Custom Code Guardrails production create and update paths did not apply the same sandboxing and validation used by the test endpoint, allowing a privileged user with access to create or update guardrails to submit custom Python code that executed in the LiteLLM proxy environment and could expose secrets available to the process. This issue is fixed in version 1.82.0-stable.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-59820

LiteLLM: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.7-stable, LiteLLM Skills archive extraction did not sufficiently validate file paths from uploaded skill ZIP archives, allowing an authenticated user with access to LiteLLM LLM API routes or a key whose allowed_routes includes /v1/skills, anthropic_routes, or llm_api_routes to upload a crafted skill archive containing path traversal entries that could be written outside the intended extraction or staging directory. This issue is fixed in version 1.83.7-stable.

CVSS 4.0 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-49468

LiteLLM: Authentication Bypass via Host Header Injection

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management routes. The auth layer derived the effective route from request.url.path in litellm/proxy/auth/auth_utils.py::get_request_route(), which Starlette reconstructs from the Host header. A crafted Host could therefore make the auth gate evaluate a different route from the one FastAPI dispatched. This vulnerability is fixed in 1.84.0.

CVSS 4.0 · 9.5 Critical EPSS 3.0% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12795

BerriAI litellm SSO Debug Flow ui_sso.py json.dumps missing authentication

A vulnerability was determined in BerriAI litellm up to 1.82.2. This affects the function json.dumps of the file litellm/proxy/management_endpoints/ui_sso.py of the component SSO Debug Flow. Executing a manipulation can lead to missing authentication. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12770

BerriAI litellm Admin Key key_management_endpoints.py improper authorization

A vulnerability was determined in BerriAI litellm up to 1.63.1. The impacted element is an unknown function of the file litellm/proxy/management_endpoints/key_management_endpoints.py of the component Admin Key Handler. This manipulation causes improper authorization. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: 23781. It is recommended to apply a patch to fix this issue. The vendor was contacted early about this disclosure.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12796

BerriAI litellm SSO Authentication Flow ui_sso.py get_redirect_response_from_openid session expiration

A vulnerability was identified in BerriAI litellm up to 1.82.2. This impacts the function get_redirect_response_from_openid of the file litellm/proxy/management_endpoints/ui_sso.py of the component SSO Authentication Flow. The manipulation leads to session expiration. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12772

BerriAI litellm PROXY_ADMIN database API Key Generator login_utils.py authenticate_user session expiration

A security flaw has been discovered in BerriAI litellm up to 1.82.2. This impacts the function authenticate_user of the file litellm/proxy/auth/login_utils.py of the component PROXY_ADMIN database API Key Generator. Performing a manipulation results in session expiration. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12799

BerriAI litellm Incomplete Fix CVE-2025-0628 internal_user_endpoints.py ui_view_users improper authorization

A security vulnerability has been detected in BerriAI litellm up to 1.82.2. Affected by this issue is the function ui_view_users of the file litellm/proxy/management_endpoints/internal_user_endpoints.py of the component Incomplete Fix CVE-2025-0628. Such manipulation leads to improper authorization. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm
CVE-2026-12797

BerriAI litellm Completions banned_keywords.py async_pre_call_hook authorization

A security flaw has been discovered in BerriAI litellm up to 1.82.5. Affected is the function async_pre_call_hook of the file enterprise/enterprise_hooks/banned_keywords.py of the component Completions Interface. The manipulation of the argument prompt results in incorrect authorization. The attack may be performed from remote. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Berriai Litellm
Products
Litellm Litellm