Is CVE-2026-42203 actively exploited?

No active exploitation of CVE-2026-42203 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42203 be exploited remotely?

Yes. CVE-2026-42203 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42203?

CVE-2026-42203 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-42203

CWE-1336Published: May 8, 2026· Updated: May 13, 2026

8.8

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.4th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-42203 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.