CVE-2026-89032 (GCVE-0-2026-89032)

Vulnerability from cvelistv5 – Published: 2026-09-25 16:04 – Updated: 2026-09-25 16:04 X_Open Source
VLAI
Title
BerriAI LiteLLM < 1.101.0-rc.1 Tenant Isolation Bypass via Semantic Cache Layer
Summary
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.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
7.7 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version CPE status
BerriAI litellm Affected: 0 , < 1.101.0-rc.1 (custom)
guessed Create a notification for this product.
Date Public
2026-09-03 00:00
Credits
Tanguy Snoeck
Show details on NVD website
To clipboard 

{
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          "url": "https://github.com/BerriAI/litellm/releases/tag/v1.101.0-rc.1"
        },
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          "url": "https://github.com/BerriAI/litellm/pull/39590"
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          "url": "https://github.com/BerriAI/litellm/commit/16db51e2cfc28e02bd460481e634a8403ea9265e"
        },
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          "url": "https://www.vulncheck.com/advisories/berriai-litellm-rc-1-tenant-isolation-bypass-via-semantic-cache-layer"
        }
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      "source": {
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    "dateReserved": "2026-09-10T16:23:54.472Z",
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          }
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}



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