Auth bypass in Berriai Litellm
CVE-2026-89032
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- LiteLLM v1.101.0-rc.1 Release Notes (release-notes)
- Pull Request (issue-tracking, patch)
- Patch Commit (patch)
- www.vulncheck.com/advisories/berriai-litellm-rc-1-tenant-isolation-bypass-via-s… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-89032?
- CVE-2026-89032 is a high-severity vulnerability in Berriai Litellm, classified under Incorrect Authorization. CVSS score: 7.7/10. Published 2026-09-25.
- How severe is CVE-2026-89032?
- High severity. CVSS v3 base score is 7.7 out of 10.