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CVE-2026-59822

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ee3bda0eed5fa18132cb2d21140cf4e1165ad18dcdc8fa316acbd16656594f78
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"litellm","vendor":"BerriAI","versions":[{"status":"affected","version":"< 1.84.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.8,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-306","description":"CWE-306: Missing Authentication for Critical Function","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c","tags":["x_refsource_MISC"],"url":"https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/references/2
{"name":"https://github.com/BerriAI/litellm/pull/26463","tags":["x_refsource_MISC"],"url":"https://github.com/BerriAI/litellm/pull/26463"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/references/1
{"name":"https://github.com/BerriAI/litellm/releases/tag/v1.84.0","tags":["x_refsource_MISC"],"url":"https://github.com/BerriAI/litellm/releases/tag/v1.84.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/references/3
{"name":"https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5c0fe7296c5ee85416f81c771b1e45c6863280a2fbb8620fbe7b22fb0cda3ffe · sha256:c4463a3b876ec4c8… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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