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CVE-2026-42203

LiteLLM: Server-Side Template Injection in /prompts/test endpoint

Published: May 8, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-1336
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.3%
Top 77.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-1336

Affected Products

litellmlitellm
Mixed
AI / ML / llm-serving-inference
litellmBerriAI
SaaS
AI / ML / llm-serving-inference
litellmoss-projectAI / ML
berriaicommercialAI / MLaka litellm, berriai/litellm

Exploitability

Workaround Available

References

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

Timeline

Published
May 8, 2026
Last Updated
May 13, 2026

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