Vulnerability-Lookup

GHSA-QQMF-GPG7-G8GW

Vulnerability from github – Published: 2026-07-15 18:31 – Updated: 2026-09-03 19:51

Summary

PyTorch Lightning allows arbitrary code execution through checkpoint _instantiator hyperparameters

Details

PyTorch Lightning through 2.6.5, fixed in commit d710d68, contains a remote code execution vulnerability in the _load_state function that imports and executes attacker-controlled module names from checkpoint _instantiator hyperparameters. Attackers can craft malicious checkpoint files that bypass weights_only=True protections to execute arbitrary code when LightningModule.load_from_checkpoint is called.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

8.4 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "lightning"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2022.6.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58659"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-470"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-03T19:51:19Z",
    "nvd_published_at": "2026-07-15T18:16:48Z",
    "severity": "HIGH"
  },
  "details": "PyTorch Lightning through 2.6.5, fixed in commit d710d68, contains a remote code execution vulnerability in the _load_state function that imports and executes attacker-controlled module names from checkpoint _instantiator hyperparameters. Attackers can craft malicious checkpoint files that bypass weights_only=True protections to execute arbitrary code when LightningModule.load_from_checkpoint is called.",
  "id": "GHSA-qqmf-gpg7-g8gw",
  "modified": "2026-09-03T19:51:19Z",
  "published": "2026-07-15T18:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58659"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/issues/21822"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/pull/21832"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Lightning-AI/pytorch-lightning"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/lightning/PYSEC-2026-3624.yaml"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": " PyTorch Lightning allows arbitrary code execution through checkpoint _instantiator hyperparameters"
}

CVE-2026-58659 (GCVE-0-2026-58659)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:02 – Updated: 2026-07-18 01:03 X_Open Source

Title

PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter

Summary

Severity

8.4 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-18 01:02 UTC

CWE

CWE-470 - Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/Lightning-AI/pytorch-lightning…	technical-descriptionexploit
https://github.com/Lightning-AI/pytorch-lightning…	issue-tracking
https://github.com/Lightning-AI/pytorch-lightning…	patch
https://www.vulncheck.com/advisories/pytorch-ligh…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Lightning-AI	pytorch-lightning	Affected: 0 , ≤ 2.6.5 (semver) Unaffected: d710d689510d50e800f53b3cd773cbca20b1f86f (git) cpe:2.3:a:lightningai:pytorch_lightning::::::python::*

Date Public

2026-07-10 00:00

Credits

George Chen

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-QQMF-GPG7-G8GW

CVE-2026-58659 (GCVE-0-2026-58659)

Tags

Sightings

Nomenclature