CVE-2026-42203

HIGH EPSS 24.2%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
8.6 CVSS 4.0
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.6
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
24.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-1336

Affected Products 1

VendorProductVersionRange
litellmlitellm*≥1.80.5  –  <1.83.7

References 2

  • github.com https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
    ProductRelease Notes
  • github.com https://github.com/BerriAI/litellm/security/advisories/GHSA-xqmj-j6mv-4862
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/BerriAI/litellm/security/advisories/GHSA-xqmj-j6mv-4862
    MitigationPatchVendor Advisory