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Two LiteLLM flaws let a basic user account take over the gateway or capture AI provider keys

Check Point Research disclosed two LiteLLM flaws, CVE-2026-35029 and CVE-2026-59823, both fixed in version 1.83.9. On older versions a basic account is enough to take over the gateway or capture provider API keys, according to Check Point's testing.

The Watch · Security desk

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Illustration accompanying Two LiteLLM flaws let a basic user account take over the gateway or capture AI provider keys
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Captured keys give billable access to AI providers How each LiteLLM flaw reaches the gateway and its keys. Download and star counts don't measure exposure, so no number is plotted.

CVE-2026-35029 let read-only users take over the gateway. CVE-2026-59823 let any user send requests carrying provider API keys to an attacker's server. Those keys give billable provider access; costs are billed to the organization. Both are fixed in 1.83.9 and above.

Captured keys give billable access to AI providers
WhoHowKindClaim
CVE-2026-35029Let any user, including read-only users, reach admin functions and take over the gatewayexposure4
CVE-2026-59823Let any gateway user direct LiteLLM to send API requests to a server under the attacker's controlexposure9
Redirected requestsCarried the API keys LiteLLM uses to authenticate with AI providers, via an unvalidated routeexposure10
Gateway-held credentialsGive direct, billable access to AI providers with no further authentication requiredcapability12
The organizationFaces unauthorized use of its AI provider accounts and unexpected costs billed to itcost11
Versions before 1.83.9Exposed to both flaws; fixed in 1.83.9 and above, per Check Pointexposure2

What happened

  • CVE-2026-59823 let a gateway user supply a malicious destination, and LiteLLM built an unvalidated route to the attacker's server carrying the provider API keys.
  • Check Point says it demonstrated full system takeover, credential theft and remote code execution in a controlled test environment.
  • LiteLLM draws 97 million downloads a month and has more than 59,000 GitHub stars.

Why it matters

  • exposure Every holder of a login on a gateway below 1.83.9 is a possible route to admin, read-only users included, so the account list sets the size of the exposure.
  • cost The organization that owns a captured provider key pays for whatever is run on it, and Check Point lists unexpected billing among the impacts.
  • exposure Teams that never installed LiteLLM themselves may still run it inside a platform or internal tool, where a check of their own deployments will not find it.
  • decision Upgrading closes the path, but a provider key that already left the gateway still works without further authentication, so rotation is a separate call.

CVE-2026-35029 is a permissions failure. LiteLLM uses role based access control: administrators run the system, and everyone else gets limited or read only access [5]. The flaw let minimal-privilege users reach the administrative functions that control the gateway's core configuration [5].

From there Check Point lists three moves. An attacker could read files on the server, including configuration and system files. They could overwrite administrator credentials with their own and lock the real administrators out. And they could instruct the gateway to download and execute code from an external source [6]. That last step is the route to malware installation, data exfiltration or movement to other systems on the network [7].

CVE-2026-59823 works at the request level. A gateway user supplies a malicious destination inside a request, and LiteLLM creates a new route to the attacker's server without validating it [10]. The redirected requests carry the keys LiteLLM uses to authenticate with AI providers [10]. The gateway stores keys for every provider the organization uses, so it is a concentrated target [16]. Check Point says the theft needs no compromise of OpenAI, Anthropic or any other provider [11].

We think CVE-2026-35029 is the larger exposure. It ends in code execution on the gateway host [6]. CVE-2026-59823 ends at credentials [10]. Both start from an ordinary account, so neither is easier to reach than the other [15].

All of this comes from Check Point, which found the flaws and ran the demonstrations. Its post does not report exploitation in the wild, name a threat actor, or include severity scores and disclosure dates. Check Point says it responsibly disclosed both issues to LiteLLM [14].

What to watch

  • Whether Check Point or LiteLLM publish severity scores, disclosure dates, or any report of exploitation in the wild.
  • Whether the platforms and internal tools that embed LiteLLM ship their own fixed builds.

Clarity's read

What the record supports and how the coverage leans. The claims behind it follow.

Reality

Evidence50
Adoption85
Hype gap+15
Incentives60
Confidence60
Why these scores

Claim ledger

Ranked by verification strength, evidence, and original report placement.

  1. [1]

    Check Point Research discovered two high risk vulnerabilities in LiteLLM, tracked as CVE-2026-35029 and CVE-2026-59823.

    ReportedSupportedView cited source
  2. [2]

    Both vulnerabilities are fixed in LiteLLM version 1.83.9 and above, and organizations running earlier versions are exposed to both and should update immediately, according to Check Point.

    ReportedSupportedView cited source
  3. [3]

    LiteLLM has 97 million downloads per month and over 59,000 GitHub stars.

    ReportedSupportedView cited source

Sources

1 independent publisher whose own reporting we read for this story.

  1. blog.checkpoint.com

    1 article · October 13, 2026

    Check Point Research Discovers High Risk Vulnerabilities in LiteLLM, One of the Most Widely Used LLM Gateways

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