CVE-2026-59822 KEV
8.2
HIGH · CVSS 3.1 · EPSS 0.8% (pctl 56)
Patch first
On CISA KEV — known exploited in the wild, due 2026-09-16.
Description
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.
Scoring
| CVSS | 8.2 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N |
| EPSS | 0.84% — more likely to be exploited than 56% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | yes — remediate by 2026-09-16 |
| Public exploit | none known |
| Published | 2026-07-08 |
| Last modified | 2026-09-03 |
CISA KEV
| Name | BerriAI LiteLLM Improper Authentication Vulnerability |
|---|---|
| Added | 2026-09-02 |
| Due | 2026-09-16 |
| Vendor / product | BerriAI / LiteLLM |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| litellm | litellm |
References
- https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c
- https://github.com/BerriAI/litellm/pull/26463
- https://github.com/BerriAI/litellm/releases/tag/v1.84.0
- https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-59822
- https://www.wiz.io/blog/ai-infrastructure-honeypot
→ the Explorer · watch your stack · NVD