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CVE-2026-59822

HighCVSS 8.8 / 10
Published Jul 8, 2026·Last modified Jul 11, 2026
Affected Components(971)
berriai/litellm
1.40.17
berriai/litellm
1.30.7
berriai/litellm
1.35.33.dev4
1 / 324
Description

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.

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Risk Scores
Base Score
8.8

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
8.8

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.84%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Attacked

This vulnerability is actively being exploited in the wild. Please take immediate action to mitigate the risk.

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