CVE-2026-31221

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fixed version is listed under Patch Availability — apply it.

PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.load_from_checkpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the security-restrictive weights_only=True parameter. This default behavior allows the deserialization of arbitrary Python objects via the Pickle module. A remote attacker can exploit this by providing a maliciously crafted checkpoint file, leading to arbitrary code execution on the victim's system when the file is loaded.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

Published

May 12, 2026

Last Modified

May 15, 2026

Advisory Details (2)

Auto-updated May 14, 2026
Fixed version listed under Patch Availability.
generic

Notion

https://www.notion.so/CVE-2026-31221-35d1e1393188815f8db7c4fd08076639
generic

GitHub - Lightning-AI/pytorch-lightning: Pretrain, finetune ANY AI model of ANY size on 1 or 10,000+ GPUs with zero code changes. · GitHub

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

Vendor Advisories for CVE-2026-31221(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
pippytorch-lightning—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 1 ecosystem)
PyPI(2)
PackageVulnerable rangeFix by version rangeDependents
lightning0.0.2 ... 2.6.0.dev20260125 (316 versions)
  • every version through 2.6.0: no fix on record
—
pytorch-lightning0.0.2 ... 2.6.0.dev0 (219 versions)
  • every version through 2.6.0: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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.

Showing the most recent 100 of 254 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-07 23:47 UTCEPSS rescore
  5. 2026-10-06 15:17 UTCEPSS rescore
  6. 2026-10-05 17:42 UTCEPSS rescore
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-30 06:28 UTCOSV refresh
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-26 15:58 UTCEPSS rescore
  14. 2026-09-26 00:26 UTCEPSS rescore
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-20 20:15 UTCEPSS rescore
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-18 19:27 UTCEPSS rescore
  19. 2026-09-17 19:30 UTCEPSS rescore
  20. 2026-09-16 14:08 UTCEPSS rescore
  21. 2026-09-16 05:15 UTCEPSS rescore
  22. 2026-09-13 16:47 UTCEPSS rescore
  23. 2026-09-12 15:01 UTCEPSS rescore
  24. 2026-09-11 14:52 UTCEPSS rescore
  25. 2026-09-11 11:23 UTCOSV refresh
Show 75 more
  1. 2026-09-10 09:34 UTCEPSS rescore
  2. 2026-09-08 22:00 UTCEPSS rescore
  3. 2026-09-07 16:01 UTCEPSS rescore
  4. 2026-09-06 13:47 UTCEPSS rescore
  5. 2026-09-06 13:47 UTCEPSS rescore
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:11 UTCEPSS rescore
  8. 2026-09-01 13:53 UTCEPSS rescore
  9. 2026-09-01 04:39 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 01:22 UTCEPSS rescore
  13. 2026-08-28 21:41 UTCEPSS rescore
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-24 14:17 UTCEPSS rescore
  18. 2026-08-23 18:25 UTCEG score recompute
  19. 2026-08-23 18:25 UTCGHSA enrichment
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-19 17:03 UTCEPSS rescore
  25. 2026-08-18 13:48 UTCEPSS rescore
  26. 2026-08-17 13:47 UTCEPSS rescore
  27. 2026-08-17 10:55 UTCEG score recompute
  28. 2026-08-17 10:55 UTCGHSA enrichment
  29. 2026-08-16 14:56 UTCEPSS rescore
  30. 2026-08-16 04:17 UTCEG score recompute
  31. 2026-08-16 04:17 UTCGHSA enrichment
  32. 2026-08-16 02:14 UTCEPSS rescore
  33. 2026-08-15 01:30 UTCEPSS rescore
  34. 2026-08-14 14:46 UTCGHSA enrichment
  35. 2026-08-14 02:48 UTCEG score recompute
  36. 2026-08-14 02:48 UTCGHSA enrichment
  37. 2026-08-13 22:00 UTCEPSS rescore
  38. 2026-08-13 04:15 UTCGHSA enrichment
  39. 2026-08-12 16:17 UTCEG score recompute
  40. 2026-08-12 16:17 UTCGHSA enrichment
  41. 2026-08-12 13:50 UTCEPSS rescore
  42. 2026-08-11 15:43 UTCEG score recompute
  43. 2026-08-11 15:43 UTCGHSA enrichment
  44. 2026-08-11 01:58 UTCEG score recompute
  45. 2026-08-11 01:58 UTCGHSA enrichment
  46. 2026-08-11 00:00 UTCEPSS rescore
  47. 2026-08-10 14:00 UTCGHSA enrichment
  48. 2026-08-10 02:02 UTCGHSA enrichment
  49. 2026-08-09 14:05 UTCEG score recompute
  50. 2026-08-09 14:05 UTCGHSA enrichment
  51. 2026-08-09 13:46 UTCEPSS rescore
  52. 2026-08-09 02:07 UTCEG score recompute
  53. 2026-08-09 02:07 UTCGHSA enrichment
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-08 13:26 UTCGHSA enrichment
  56. 2026-08-08 01:27 UTCEG score recompute
  57. 2026-08-08 01:27 UTCGHSA enrichment
  58. 2026-08-07 13:29 UTCGHSA enrichment
  59. 2026-08-07 01:31 UTCEG score recompute
  60. 2026-08-07 01:31 UTCGHSA enrichment
  61. 2026-08-06 13:46 UTCEPSS rescore
  62. 2026-08-06 09:58 UTCGHSA enrichment
  63. 2026-08-05 21:51 UTCEG score recompute
  64. 2026-08-05 21:51 UTCGHSA enrichment
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-04 15:10 UTCEPSS rescore
  67. 2026-08-04 10:38 UTCEPSS rescore
  68. 2026-08-03 19:17 UTCEG score recompute
  69. 2026-08-03 19:17 UTCGHSA enrichment
  70. 2026-08-03 10:36 UTCEPSS rescore
  71. 2026-08-02 23:29 UTCGHSA enrichment
  72. 2026-08-02 11:31 UTCEG score recompute
  73. 2026-08-02 11:30 UTCGHSA enrichment
  74. 2026-08-02 02:26 UTCEPSS rescore
  75. 2026-08-01 23:32 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-31221?
CVE-2026-31221 is a high vulnerability published on May 12, 2026. PyTorch-Lightning versions 2.6.0 and earlier contain an insecure deserialization vulnerability (CWE-502) in the checkpoint loading mechanism. The LightningModule.loadfromcheckpoint() method, which is commonly used to load saved model states, internally calls torch.load() without setting the…
When was CVE-2026-31221 disclosed?
CVE-2026-31221 was first published on May 12, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31221 actively exploited?
CVE-2026-31221 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-31221?
CVE-2026-31221 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-31221?
A fixed version for CVE-2026-31221 is listed under Patch Availability on this page: update to the version listed for your package. The vendor advisories EchelonGraph has for CVE-2026-31221 are linked in the Vendor Advisories panel on this page.

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