← Vulnerability feed

Vulnerability record · CVE-2026-42203 · published 8 May 2026

CVE-2026-42203: Litellm code injection vulnerability

Litellm · Litellm

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.

8.6 CVSS 4.0 High EPSS 0.66% · top 50.3% CWE-1336 · CWE-1336CWE-94 · Code injection
8.6CVSS 4.0 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
15 Jul 2026Last modified by NVD

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: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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2026-42203 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.4CVE-2026-33634Trivy and trivy-action supply chain compromise via malicious release and tagsA threat actor used compromised credentials to publish a malicious Trivy v0.69.4 release, force-push 76 of 77 version tags in aquasecurity/trivy-acti…KEVEPSS 1.7%analysed9.3CVE-2026-42208LiteLLM proxy SQL injection in API key checkLiteLLM versions 1.81.16 to before 1.83.7 build a database query for proxy API key checks by concatenating the caller-supplied key into the query tex…KEVEPSS 5.8%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed8.7CVE-2026-42271LiteLLM MCP test endpoints allow authenticated OS command injectionLiteLLM versions 1.74.2 through before 1.83.7 expose two MCP preview endpoints (POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list) th…KEVEPSS 13%analysed9.8CVE-2024-5751Litellm code injection vulnerabilityBerriAI/litellm version v1.35.8 contains a vulnerability where an attacker can achieve remote code execution. The vulnerability exists in the `add_de…EPSS 0.88%9.8CVE-2024-2952Litellm vulnerabilityBerriAI/litellm is vulnerable to Server-Side Template Injection (SSTI) via the `/completions` endpoint. The vulnerability arises from the `hf_chat_te…EPSS 1.3%9.5CVE-2026-49468Litellm authentication bypass by spoofing vulnerabilityLiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM prox…EPSS 0.82%9.4CVE-2026-35030Litellm improper authentication vulnerabilityLiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, when JWT authentication is enabled (enable_jwt…EPSS 0.88%

Source: NIST National Vulnerability Database (record CVE-2026-42203), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.