CVE-2026-42203

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.80.5 to before version 1.83.7, the POST /prompts/test endpoint accepted user-supplied prompt templates and rendered them without sandboxing. A crafted template could run arbitrary code inside the LiteLLM Proxy process. The endpoint only checks that the caller presents a valid proxy API key, so any authenticated user could reach it. Depending on how the proxy is deployed, this could expose secrets in the process environment (such as provider API keys or database credentials) and allow commands to be run on the host. This issue has been patched in version 1.83.7.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable	Product Release Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-xqmj-j6mv-4862	Mitigation Patch Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-42203
https://bugzilla.redhat.com/show_bug.cgi?id=2467917
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42203.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-08 04:16

Updated : 2026-07-15 02:21

NVD link : CVE-2026-42203

Mitre link : CVE-2026-42203

CVE.ORG link : CVE-2026-42203

JSON object : View

Products Affected

litellm

litellm

CWE

CWE-1336

Improper Neutralization of Special Elements Used in a Template Engine

CWE-94

Improper Control of Generation of Code ('Code Injection')

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