High 7.8Published Jul 15, 2026

CVE-2026-58659PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter

Updated under an hour ago (2026-10-19 07:23 UTC)

Does this affect you?

It affects Lightning-AI pytorch-lightning and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Lightning-AI pytorch-lightning

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-470
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Lightning-AI pytorch-lightning lightning_ai:pytorch_lightning (from the name)	through 2.6.5; d710d689510d50e800f53b3cd773cbca20b1f86f not affected	CNA record
lightningai pytorch_lightning lightningai:pytorch_lightning	through 2.6.5	NVD

References

https://github.com/Lightning-AI/pytorch-lightning/issues/21822technical-description, exploit
https://github.com/Lightning-AI/pytorch-lightning/pull/21832issue-tracking
https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86fpatch
https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameterthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.