Vulnerability detail
Enriched intelligence for a single CVE
High
CVE-2026-42271
PUBLISHEDLiteLLM: Authenticated command execution via MCP stdio test endpoints
- Vendor
- BerriAI
- Product
- litellm
- Published
- May 08, 2026
- EPSS
- 4.1% · 89% pctl
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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 scores
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitation status
Exploited in the wild
Recorded 2026-06-08 18:00:47 UTC · CISA
Known exploited vulnerability sources
Catalogues that list this CVE as a known exploited vulnerability.
| Source | Added |
|---|---|
| CISA First | 2026-06-08 18:00 UTC |
| CVE | 2026-06-08 18:10 UTC |
| All CISA Advisories | 2026-06-08 20:20 UTC |
| TheHackerNews | 2026-06-09 07:20 UTC |
Scanner integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-42271.yaml | Jun 03, 2026 |
Recent mentions
TheHackerNews · Jun 09, 2026
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added a high-severity flaw impacting BerriAI LiteLLM to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-42271 (CVSS score: 8.7), is a command injection vulnerability that could allow any authenticated user to run arbitrary commands on the
All CISA Advisories · Jun 08, 2026
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-42271 BerriAI LiteLLM Command Injection Vulnerability CVE-2026-50751 Check Point Security Gateway Improper Authentication Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.
Timeline
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CVE ID Reserved
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CVE Published to Public
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Detected by Nuclei
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Added to KEVIntel
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KEV confirmed by CVE
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KEV confirmed by All CISA Advisories
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KEV confirmed by TheHackerNews