CVE-2026-42271
BerriAI LiteLLM Command Injection Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 22 June 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.74.2 to before version 1.83.7, two endpoints used to preview an MCP server before saving it — POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list — accepted a full server configuration in the request body, including the command, args, and env fields used by the stdio transport. When called with a stdio configuration, the endpoints attempted to connect, which spawned the supplied command as a subprocess on the proxy host with the privileges of the proxy process. The endpoints were gated only by a valid proxy API key, with no role check. Any authenticated user — including holders of low-privilege internal-user keys — could therefore run arbitrary commands on the host. This issue has been patched in version 1.83.7.
- CVSS 4.0
- 8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 83.59% probability · 100th percentile
- CISA KEV
- Listed 8 June 2026 · due 22 June 2026
- Weakness
- CWE-77, CWE-78
- Affected
- litellm/litellm · redhat/openshift ai
- Source
- security-advisories@github.com
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g ; https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable ; https://nvd.nist.gov/vuln/detail/CVE-2026-42271
References
- https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stableProduct, Release Notes
- https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94gMitigation, Patch, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:27784Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:28960Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:30056Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-42271Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2467924Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42271.jsonThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.