Vulnerability-Lookup

PYSEC-2026-3624

Vulnerability from pysec - Published: 2026-07-15 18:16 - Updated: 2026-08-07 09:08

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

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

Impacted products

Name	purl
lightning	pkg:pypi/lightning

Aliases

CVE-2026-58659

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "lightning",
        "purl": "pkg:pypi/lightning"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2022.6.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.0",
        "1.8.0.post1",
        "1.8.0rc1",
        "1.8.0rc2",
        "1.8.1",
        "1.8.2",
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        "1.8.6",
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        "2.2.0rc0",
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    }
  ],
  "aliases": [
    "CVE-2026-58659"
  ],
  "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": "PYSEC-2026-3624",
  "modified": "2026-08-07T09:08:04.834348Z",
  "published": "2026-07-15T18:16:48.743Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/issues/21822"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Lightning-AI/pytorch-lightning/pull/21832"
    },
    {
      "type": "FIX",
      "url": "https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter"
    }
  ],
  "severity": [
    {
      "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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 (v2.0.3)

CWE

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

Assigner

VulnCheck

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)

Date Public

2026-07-10 00:00

Credits

George Chen

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-18T01:02:53.086792Z",
                "version": "2.0.3"
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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.

Action not permitted

PYSEC-2026-3624

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

Tags

Sightings

Nomenclature