Vulnerability in BerriAI litellm

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund27 Sep 2026WID-SEC-2026-3599

  LiteLLM: Vulnerability allows bypassing security measures Translated from German

  CVE-2026-89032

[ References ]References

• github.com/BerriAI/litellm/commit/16db51e2cfc28e02bd460481e634a8403ea9265e
• github.com/BerriAI/litellm/pull/39590
• github.com/BerriAI/litellm/releases/tag/v1.101.0-rc.1
• www.vulncheck.com/advisories/berriai-litellm-rc-1-tenant-isolation-bypass-via-semantic-…