PT-2026-60248 · Pypi · Pytorch-Lightning

George Chen · CVE-2026-58659 · Published 2026-07-15 · Updated 2026-07-20

Positive Technologies (AI Summary)

CVSS v4.0

8.4

High

Base vector

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

Name of the Vulnerable Software and Affected Versions PyTorch Lightning versions prior to 2.6.6

Description A remote code execution issue exists in the load state function. The flaw allows the import and execution of attacker-controlled module names from checkpoint instantiator hyperparameters. An attacker can create malicious checkpoint files that bypass weights only=True protections to execute arbitrary code when the load from checkpoint function of LightningModule is called.

Recommendations Update PyTorch Lightning to version 2.6.6 or later.

Exploit

Fix

Weakness Enumeration

CWE-470

Related Identifiers

CVE-2026-58659

PYSEC-2026-3624

Affected Products

Pytorch-Lightning

References · 10

• 🔥 https://github.com/Lightning-AI/pytorch-lightning/issues/21822 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58659.json · Exploit
• https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f · Patch
• https://github.com/Lightning-AI/pytorch-lightning/pull/21832 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-58659 · Security Note
• https://osv.dev/vulnerability/PYSEC-2026-3624 · Vendor Advisory
• https://vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter · Patch
• https://osv.dev/vulnerability/CVE-2026-58659 · Vendor Advisory
• https://github.com/Lightning-AI/pytorch-lightning · Note
• https://twitter.com/vulnipulse/status/2079244499193348112 · Twitter Post