High 8.6Published May 7, 2026

CVE-2026-42203LiteLLM: Server-Side Template Injection in /prompts/test endpoint

Updated under an hour ago (Oct 28, 2026, 7:30 AM ET)

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It affects BerriAI litellm and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for BerriAI litellm

Exploited in the last 30 days

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: 8.6 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-1336, CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

BerriAI litellm berriai:litellm (from the name)	from 1.80.5, < 1.83.7	CNA record
Red Hat Exploit Intelligence redhat:exploit_intelligence	0	CISA ADP
Red Hat Red Hat Ansible Automation Platform 2 redhat:ansible_automation_platform	2	CISA ADP
Red Hat Red Hat OpenShift AI (RHOAI) redhat:openshift_ai	Versions not stated	CISA ADP
litellm litellm litellm:litellm	from 1.80.5 before 1.83.7	NVD

References

References

https://github.com/BerriAI/litellm/security/advisories/GHSA-xqmj-j6mv-4862	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable	x-refsource-misc, product, release-notes
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.