CVE-2026-12799: BerriAI litellm UI User Enumeration Leads To Vulnerability

LOW
Advisory Identifier: GHSA-m2v5-74w2-qhcj
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CVSS 4.3
CWE-266
Published
Advisory Summary

CVE-2026-12799 is a LOW (CVSS 4.3) ui user enumeration leads to vulnerability (CWE-266: Incorrect Privilege Assignment) affecting BerriAI litellm libraries in the PyPI ecosystem. The issue involves ui user enumeration leads to system-wide information disclosure. Remediation is available in the latest vendor maintenance releases.

CVE-2026-12799 at a Glance

CVE Identifier CVE-2026-12799
GHSA Identifier GHSA-m2v5-74w2-qhcj
Severity LOW
CVSS v3.1 Base Score 4.3
CWE Classification CWE-266: Incorrect Privilege Assignment
Affected Product BerriAI litellm
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.3

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

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

How to Fix CVE-2026-12799

To remediate this vulnerability, upgrade all affected BerriAI 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: Latest secure release 
pip install litellm>=Latest secure release
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-2026-12799, inspect your installed packages using pip:

pip show litellm

Analyze the terminal output to locate any version of BerriAI litellm in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-266: Incorrect Privilege Assignment, where a product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor. In BerriAI 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

A security vulnerability has been detected in BerriAI litellm up to 1.82.2. Affected by this issue is the function ui_view_users of the file litellm/proxy/management_endpoints/internal_user_endpoints.py of the component Incomplete Fix CVE-2025-0628. Such manipulation leads to improper authorization. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.

CVE-2026-12799 Affected BerriAI litellm Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
litellm
pypi/litellm
PyPI
≤ 1.82.2

References

NVD — CVE-2026-12799 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-12799
BerriAI litellm Source Repository REPOSITORY
https://gist.github.com/YLChen-007/3ace22e33e468d0166fe609c9fdf4184
BerriAI litellm Source Repository REPOSITORY
https://github.com/BerriAI/litellm
vuldb.com/cve/cve-2026-12799 WEB
https://vuldb.com/cve/CVE-2026-12799
vuldb.com/submit/811291 WEB
https://vuldb.com/submit/811291
vuldb.com/vuln/372561 WEB
https://vuldb.com/vuln/372561
vuldb.com/vuln/372561/cti WEB
https://vuldb.com/vuln/372561/cti

Frequently Asked Questions

What is CVE-2026-12799?
CVE-2026-12799 is a security vulnerability in BerriAI litellm involving UI User Enumeration leads to System-Wide Information Disclosure under CWE-266: Incorrect Privilege Assignment.
Which BerriAI litellm versions are affected?
Affected versions include releases prior to current release patches across affected packages: litellm.
What version fixes CVE-2026-12799?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is litellm affected?
Yes, litellm is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-12799?
CVE-2026-12799 has a CVSS v3.1 base score of 4.3 (LOW) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-12799?
CVE-2026-12799 is classified under CWE-266: Incorrect Privilege Assignment (A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.).
How can I check PyPI dependencies for CVE-2026-12799?
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-m2v5-74w2-qhcj",
  "modified" : "2026-09-14T18:11:50Z",
  "published" : "2026-06-21T12:30:52Z",
  "aliases" : [ "CVE-2026-12799" ],
  "summary" : "BerriAI litellm: UI User Enumeration leads to System-Wide Information Disclosure",
  "details" : "A security vulnerability has been detected in BerriAI litellm up to 1.82.2. Affected by this issue is the function ui_view_users of the file litellm/proxy/management_endpoints/internal_user_endpoints.py of the component Incomplete Fix CVE-2025-0628. Such manipulation leads to improper authorization. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "litellm"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.82.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-12799"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/YLChen-007/3ace22e33e468d0166fe609c9fdf4184"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/BerriAI/litellm"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-12799"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/811291"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/372561"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/372561/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-266" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-14T18:11:50Z",
    "nvd_published_at" : "2026-06-21T10:16:17Z"
  }
}