CVE-2021-4118: Pytorch lightning Pytorch-lightning Is Vulnerable To Deserialization Vulnerability

HIGH
Advisory Identifier: GHSA-2vj5-px25-gjrp
Share
CVSS 7.8
CWE-502
Published
Advisory Summary

CVE-2021-4118 is a HIGH (CVSS 7.8) pytorch-lightning is vulnerable to deserialization vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Pytorch lightning libraries in the PyPI ecosystem. The issue involves pytorch-lightning is vulnerable to deserialization of untrusted data. Remediation is available by upgrading affected packages to version 1.6.0.

CVE-2021-4118 at a Glance

CVE Identifier CVE-2021-4118
GHSA Identifier GHSA-2vj5-px25-gjrp
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Pytorch lightning
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

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

How to Fix CVE-2021-4118

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

pytorch-lightning fixed: 1.6.0 
pip install pytorch-lightning>=1.6.0
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 pytorch-lightning

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-4118, inspect your installed packages using pip:

pip show pytorch-lightning

Analyze the terminal output to locate any version of Pytorch lightning in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.6.0), your application is affected.

Note: The pip show pytorch-lightning 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 Pytorch lightning, 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

pytorch-lightning is vulnerable to Deserialization of Untrusted Data.

CVE-2021-4118 Affected Pytorch lightning Versions

1 component(s)
Fixed Versions:
1.6.0
Product / Package Ecosystem Affected Versions Fixed Version
pytorch-lightning
pypi/pytorch-lightning
PyPI
< 1.6.0
1.6.0

References

NVD — CVE-2021-4118 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4118
Pytorch lightning Source Repository REPOSITORY
https://github.com/PyTorchLightning/pytorch-lightning/issues/11045
Pytorch lightning Source Repository REPOSITORY
https://github.com/PyTorchLightning/pytorch-lightning/pull/11099
Security Fix Commit FIX COMMIT
https://github.com/pytorchlightning/pytorch-lightning/commit/62f1e82e032eb16565e676d39e0db0cac7e34ace
Pytorch lightning Release RELEASE
https://github.com/PyTorchLightning/pytorch-lightning/releases/tag/1.6.0
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-2vj5-px25-gjrp
Pytorch lightning Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pytorch-lightning/PYSEC-2021-874.yaml
Pytorch lightning Source Repository REPOSITORY
https://github.com/pytorchlightning/pytorch-lightning
huntr.dev/bounties/31832f0c-e... WEB
https://huntr.dev/bounties/31832f0c-e5bb-4552-a12c-542f81f111e6

Frequently Asked Questions

What is CVE-2021-4118?
CVE-2021-4118 is a security vulnerability in Pytorch lightning involving pytorch-lightning is vulnerable to Deserialization of Untrusted Data under CWE-502: Deserialization of Untrusted Data.
Which Pytorch lightning versions are affected?
Affected versions include releases prior to 1.6.0 across affected packages: pytorch-lightning.
What version fixes CVE-2021-4118?
Upgrading to 1.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pytorch-lightning affected?
Yes, pytorch-lightning is affected in releases prior to 1.6.0. Upgrade your dependency to 1.6.0 or later.
What is the CVSS score of CVE-2021-4118?
CVE-2021-4118 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-4118?
CVE-2021-4118 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-2021-4118?
Run the dependency tree command: 'pip show pytorch-lightning'. 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-2vj5-px25-gjrp",
  "modified" : "2024-10-25T20:50:29Z",
  "published" : "2022-01-06T23:58:59Z",
  "aliases" : [ "CVE-2021-4118" ],
  "summary" : "pytorch-lightning is vulnerable to Deserialization of Untrusted Data",
  "details" : "pytorch-lightning is vulnerable to Deserialization of Untrusted Data.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pytorch-lightning"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-4118"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PyTorchLightning/pytorch-lightning/issues/11045"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PyTorchLightning/pytorch-lightning/pull/11099"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pytorchlightning/pytorch-lightning/commit/62f1e82e032eb16565e676d39e0db0cac7e34ace"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/PyTorchLightning/pytorch-lightning/releases/tag/1.6.0"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-2vj5-px25-gjrp"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pytorch-lightning/PYSEC-2021-874.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pytorchlightning/pytorch-lightning"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/31832f0c-e5bb-4552-a12c-542f81f111e6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-05T17:49:21Z",
    "nvd_published_at" : "2021-12-23T18:15:00Z"
  }
}