lightning-ai/pytorch-lightning · Security
PyTorch Lightning allows arbitrary code execution through checkpoint _instantiator hyperparameters
- GHSA ID
- GHSA-qqmf-gpg7-g8gw
- CVE ID
- CVE-2026-58659
- Severity
- high
- Published
- Updated
- CVSS
- 7.8 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CVSS v3
- 7.8 · CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CVSS v4
- 8.4 · 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
Description
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.
CWEs
- CWE-470 · Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-58659 ↗
- https://github.com/Lightning-AI/pytorch-lightning/issues/21822 ↗
- https://github.com/Lightning-AI/pytorch-lightning/pull/21832 ↗
- https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f ↗
- https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter ↗
- https://github.com/pypa/advisory-database/tree/main/vulns/lightning/PYSEC-2026-3624.yaml ↗
- https://github.com/Lightning-AI/pytorch-lightning/releases/tag/2.6.6 ↗
- https://github.com/advisories/GHSA-qqmf-gpg7-g8gw ↗
- https://github.com/pypa/advisory-database/tree/main/vulns/pytorch-lightning/PYSEC-2026-3967.yaml ↗