CVE-2026-58659

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-15. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.8
EG Score
7.8(high)
EG Risk
51(Track*)
EG Risk 51/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 18, 2026

Advisory Details (4)

Auto-updated Jul 15, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

PyTorch Lightning Arbitrary Code Execution via _instantiator Hyperparameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/pytorch-lightning-arbitrary-code-execution-via-instantiator-hyperparameter
github_pr

fix(checkpoint): prevent arbitrary code execution via `_instantiator` in `load_from_checkpoint`

Fix merged in Lightning-AI/pytorch-lightning PR #21832 on 2026-07-14 — awaiting tagged release

https://github.com/Lightning-AI/pytorch-lightning/pull/21832
generic

Arbitrary code execution via the `_instantiator` hyperparameter in `LightningModule.load_from_checkpoint` — defeats `torch.load(weights_only=True)` · Issue #21822 · Lightning-AI/pytorch-lightning · GitHub

https://github.com/Lightning-AI/pytorch-lightning/issues/21822
github_commit

commit d710d689510d (Lightning-AI/pytorch-lightning)

Fix landed in Lightning-AI/pytorch-lightning commit d710d689510d — awaiting tagged release

https://github.com/Lightning-AI/pytorch-lightning/commit/d710d689510d50e800f53b3cd773cbca20b1f86f

Vendor Advisories for CVE-2026-58659(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 10:13 UTCGHSA enrichment
  2. 2026-07-26 22:54 UTCEG score recompute
  3. 2026-07-26 22:54 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 11:35 UTCEG score recompute
  7. 2026-07-26 11:34 UTCGHSA enrichment
  8. 2026-07-25 14:18 UTCEPSS rescore
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-23 14:18 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 03:21 UTCEG score recompute
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-21 15:25 UTCEPSS rescore
  19. 2026-07-20 17:08 UTCEPSS rescore
  20. 2026-07-19 14:31 UTCEPSS rescore
  21. 2026-07-19 02:37 UTCEG score recompute
  22. 2026-07-19 02:37 UTCGHSA enrichment
  23. 2026-07-19 02:29 UTCEPSS rescore
  24. 2026-07-18 10:04 UTCEPSS rescore
  25. 2026-07-17 03:29 UTCGHSA enrichment
Show 5 more
  1. 2026-07-16 17:03 UTCEPSS rescore
  2. 2026-07-16 16:09 UTCGHSA enrichment
  3. 2026-07-16 04:48 UTCGHSA enrichment
  4. 2026-07-15 17:29 UTCEG score recompute
  5. 2026-07-15 17:28 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58659?
CVE-2026-58659 is a high vulnerability published on July 15, 2026. PyTorch Lightning through 2.6.5, fixed in commit d710d68, contains a remote code execution vulnerability in the loadstate function that imports and executes attacker-controlled module names from checkpoint instantiator hyperparameters. Attackers can craft malicious checkpoint files that bypass…
When was CVE-2026-58659 disclosed?
CVE-2026-58659 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58659 actively exploited?
CVE-2026-58659 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.7% of all scored CVEs.
What is the CVSS score of CVE-2026-58659?
CVE-2026-58659 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-58659?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58659, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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