CVE-2026-37004: Litellm LiteLLM Vulnerable To Server-side Template Vulnerability

CRITICAL
Advisory Identifier: GHSA-6wvf-77m9-58rm
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CVSS 9.8
CWE-1336
Published
Advisory Summary

CVE-2026-37004 is a CRITICAL (CVSS 9.8) litellm vulnerable to server-side template vulnerability (CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine) affecting Litellm libraries in the PyPI ecosystem. The issue involves litellm vulnerable to server-side template injection in the /prompts/test endpoint. Remediation is available by upgrading affected packages to version 1.83.7.

CVE-2026-37004 at a Glance

CVE Identifier CVE-2026-37004
GHSA Identifier GHSA-6wvf-77m9-58rm
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
Affected Product Litellm
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-37004

To remediate this vulnerability, upgrade all affected Litellm dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

litellm fixed: 1.83.7 
pip install litellm>=1.83.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show litellm

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-37004, inspect your installed packages using pip:

pip show litellm

Analyze the terminal output to locate any version of Litellm in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.83.7), your application is affected.

Note: The pip show litellm command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine, where the product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. In Litellm, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

BerriAI litellm <=1.82.4 is vulnerable to Server-Side Template Injection (SSTI), which allows unauthenticated remote attackers to execute arbitrary OS commands via a crafted dotprompt_content parameter in the /prompts/test endpoint due to use of an unsandboxed jinja2.Environment.

CVE-2026-37004 Affected Litellm Versions

1 component(s)
Fixed Versions:
1.83.7
Product / Package Ecosystem Affected Versions Fixed Version
litellm
pypi/litellm
PyPI
< 1.83.7
1.83.7

References

NVD — CVE-2026-37004 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-37004
Security Fix Commit FIX COMMIT
https://github.com/BerriAI/litellm/commit/d910a95661fce3cdd36f3b06c03ecf9c46c6457c
Litellm Source Repository REPOSITORY
https://github.com/BerriAI/litellm
Litellm Source Repository REPOSITORY
https://github.com/BerriAI/litellm/blob/244bdffd1bfe7bebdfdef516e1ebe426a898e2f0/litellm/proxy/prompts/prompt_endpoints.py#L1073
Litellm Release RELEASE
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
yerangamage.com/cves/detail/ WEB
https://yerangamage.com/cves/detail/?slug=litellm-ssti-rce

Frequently Asked Questions

What is CVE-2026-37004?
CVE-2026-37004 is a security vulnerability in Litellm involving LiteLLM vulnerable to server-side template injection in the /prompts/test endpoint under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine.
Which Litellm versions are affected?
Affected versions include releases prior to 1.83.7 across affected packages: litellm.
What version fixes CVE-2026-37004?
Upgrading to 1.83.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is litellm affected?
Yes, litellm is affected in releases prior to 1.83.7. Upgrade your dependency to 1.83.7 or later.
What is the CVSS score of CVE-2026-37004?
CVE-2026-37004 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-37004?
CVE-2026-37004 is classified under CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine (The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.).
How can I check PyPI dependencies for CVE-2026-37004?
Run the dependency tree command: 'pip show litellm'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6wvf-77m9-58rm",
  "modified" : "2026-09-08T21:31:48Z",
  "published" : "2026-08-27T21:31:31Z",
  "aliases" : [ "CVE-2026-37004" ],
  "summary" : "LiteLLM vulnerable to server-side template injection in the /prompts/test endpoint",
  "details" : "BerriAI litellm <=1.82.4 is vulnerable to Server-Side Template Injection (SSTI), which allows unauthenticated remote attackers to execute arbitrary OS commands via a crafted dotprompt_content parameter in the /prompts/test endpoint due to use of an unsandboxed jinja2.Environment.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "litellm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.83.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-37004"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/BerriAI/litellm/commit/d910a95661fce3cdd36f3b06c03ecf9c46c6457c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/BerriAI/litellm"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/BerriAI/litellm/blob/244bdffd1bfe7bebdfdef516e1ebe426a898e2f0/litellm/proxy/prompts/prompt_endpoints.py#L1073"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable"
  }, {
    "type" : "WEB",
    "url" : "https://yerangamage.com/cves/detail/?slug=litellm-ssti-rce"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1336" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-08T21:31:48Z",
    "nvd_published_at" : "2026-08-27T20:17:41Z"
  }
}