CVE-2026-31238: Ludwig Ludwig Framework Is Vulnerable To Vulnerability

CRITICAL
Advisory Identifier: GHSA-xp5q-5q7g-q26r
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CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2026-31238 is a CRITICAL (CVSS 9.8) ludwig framework is vulnerable to vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Ludwig libraries in the PyPI ecosystem. The issue involves ludwig framework is vulnerable to insecure deserialization in its model serving component. Remediation is available in the latest vendor maintenance releases.

CVE-2026-31238 at a Glance

CVE Identifier CVE-2026-31238
GHSA Identifier GHSA-xp5q-5q7g-q26r
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Ludwig
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-2026-31238

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

ludwig fixed: Latest secure release 
pip install ludwig>=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 ludwig

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-31238, inspect your installed packages using pip:

pip show ludwig

Analyze the terminal output to locate any version of Ludwig 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 ludwig command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Ludwig, 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

The Ludwig framework thru 0.10.4 is vulnerable to insecure deserialization (CWE-502) in its model serving component. When starting a model server with the ludwig serve command, the framework loads model weight files using torch.load() without enabling the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a maliciously crafted PyTorch model file, leading to arbitrary code execution on the system hosting the Ludwig model server.

CVE-2026-31238 Affected Ludwig Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
ludwig
pypi/ludwig
PyPI
≤ 0.10.4

References

NVD — CVE-2026-31238 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31238
Ludwig Source Repository REPOSITORY
https://github.com/ludwig-ai/ludwig
www.notion.so/cve-2026-31238-35d1... WEB
https://www.notion.so/CVE-2026-31238-35d1e1393188819ea77ee98ca85a2878

Frequently Asked Questions

What is CVE-2026-31238?
CVE-2026-31238 is a security vulnerability in Ludwig involving Ludwig framework is vulnerable to insecure deserialization in its model serving component under CWE-502: Deserialization of Untrusted Data.
Which Ludwig versions are affected?
Affected versions include releases prior to current release patches across affected packages: ludwig.
What version fixes CVE-2026-31238?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is ludwig affected?
Yes, ludwig 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-2026-31238?
CVE-2026-31238 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-2026-31238?
CVE-2026-31238 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check PyPI dependencies for CVE-2026-31238?
Run the dependency tree command: 'pip show ludwig'. 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-xp5q-5q7g-q26r",
  "modified" : "2026-05-27T22:17:15Z",
  "published" : "2026-05-12T18:30:41Z",
  "aliases" : [ "CVE-2026-31238" ],
  "summary" : "Ludwig framework is vulnerable to insecure deserialization in its model serving component",
  "details" : "The Ludwig framework thru 0.10.4 is vulnerable to insecure deserialization (CWE-502) in its model serving component. When starting a model server with the ludwig serve command, the framework loads model weight files using torch.load() without enabling the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the pickle module. An attacker can exploit this by providing a maliciously crafted PyTorch model file, leading to arbitrary code execution on the system hosting the Ludwig model server.",
  "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" : "ludwig"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.10.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-31238"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ludwig-ai/ludwig"
  }, {
    "type" : "WEB",
    "url" : "https://www.notion.so/CVE-2026-31238-35d1e1393188819ea77ee98ca85a2878"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-27T22:17:15Z",
    "nvd_published_at" : "2026-05-12T18:16:52Z"
  }
}