CVE-2026-58659
RCE via malicious checkpoint in PyTorch Lightning load_from_checkpoint.
Is CVE-2026-58659 being exploited?
Not confirmed. CVE-2026-58659 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-58659?
CVE-2026-58659 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-58659?
Yes. A fix has been recorded for CVE-2026-58659. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-58659 affect?
CVE-2026-58659 affects PyTorch Lightning <=2.6.5, LightningModule.load_from_checkpoint, ML training/inference pipelines that load checkpoints, CI/inference servers loading model checkpoints. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-58659?
Upgrade to commit d710d68 or later; do not load untrusted checkpoints.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution when LightningModule.load_from_checkpoint processes a crafted checkpoint; attackers can run arbitrary code on host.
Immediate action required
- affected<= 2.6.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.