CVE-2026-59822LiteLLM: MCP Authentication Bypass via OAuth2 Passthrough Fallback
Aktif olarak istismar ediliyor — BerriAI LiteLLM Improper Authentication Vulnerability
CISA bu açığın gerçek saldırılarda kullanıldığını 02.09.2026 tarihinde doğruladı. ABD federal kurumları için düzeltme son tarihi: 16.09.2026.
Gerekli işlem: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-59822
Açıklama
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.
Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.
Etkilenen ürünler ve sürümler
Kaynaklar ve yamalar
- https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q MitigationPatchVendor Advisory
- https://github.com/BerriAI/litellm/pull/26463 Issue TrackingPatch
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c Patch
- https://github.com/BerriAI/litellm/releases/tag/v1.84.0 ProductRelease Notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822 US Government Resource
- https://www.wiz.io/blog/ai-infrastructure-honeypot Third Party Advisory
CPE eşleşmeleri (NVD) (1)
cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*< 1.84.0