CVE-2026-4538

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (31st percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 5.3 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-03-22) is not newer than that change (2026-06-17), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated
7.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.8Exploit: No code on recordExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

A vulnerability was identified in PyTorch 2.10.0. The affected element is an unknown function of the component pt2 Loading Handler. The manipulation leads to deserialization. The attack can only be performed from a local environment. The exploit is publicly available and might be used. The project was informed of the problem early through a pull request but has not reacted yet.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
51
EG Risk 51/100

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 (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 22, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Apr 30, 2026
Fix referenced — no release confirmed yet.
Web page

[Security] Fix potential Arbitrary Code Execution in `torch.export.load` by forwarding `weights_only` by ez-lbz · Pull Request #176791 · pytorch/pytorch · GitHub

https://github.com/pytorch/pytorch/pull/176791
Web page

GitHub - pytorch/pytorch: Tensors and Dynamic neural networks in Python with strong GPU acceleration · GitHub

https://github.com/pytorch/pytorch/

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
pytorch1.12.0-1 ... 2.9.1+dfsg-1~exp2 (51 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
pytorch1.13.1+dfsg-4 ... 2.9.1+dfsg-1~exp2 (38 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
pytorch2.12.0+dfsg2-1 ... 2.9.1+dfsg-1~exp2 (14 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
pytorch2.12.0+dfsg2-1 ... 2.9.1+dfsg-1~exp2 (14 versions)
  • every version on: no fix on record
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
torch1.0.0 ... 2.9.1 (45 versions)
  • every version through 2.10.0: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 28× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 194 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 94 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-10-12 16:04 UTCEG score recompute
  3. 2026-10-11 19:46 UTCEG score recompute
  4. 2026-10-11 17:01 UTCEG score recompute
  5. 2026-10-11 14:26 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  7. 2026-10-11 07:25 UTCOSV refresh
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  20. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  23. 2026-09-21 19:49 UTCOSV refresh
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
Show 75 more
  1. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  2. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  3. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  4. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  5. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-09-02 16:38 UTCOSV refresh
  11. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  21. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  22. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  23. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  24. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  26. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  27. 2026-08-16 10:52 UTCEG score recompute
  28. 2026-08-16 10:52 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  29. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  30. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  31. 2026-08-14 19:47 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  32. 2026-08-14 07:03 UTCEG score recompute
  33. 2026-08-14 07:03 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  34. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  35. 2026-08-12 21:44 UTCEG score recompute
  36. 2026-08-12 21:44 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  37. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  38. 2026-08-11 21:16 UTCEG score recompute
  39. 2026-08-11 21:16 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  40. 2026-08-11 04:20 UTCEG score recompute
  41. 2026-08-11 04:20 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  42. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  43. 2026-08-10 07:18 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  44. 2026-08-09 18:58 UTCEG score recompute
  45. 2026-08-09 18:58 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  46. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  47. 2026-08-09 06:38 UTCEG score recompute
  48. 2026-08-09 06:38 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  49. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-08-08 05:20 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  51. 2026-08-07 17:00 UTCEG score recompute
  52. 2026-08-07 17:00 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  53. 2026-08-06 19:14 UTCEG score recompute
  54. 2026-08-06 19:14 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  55. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  56. 2026-08-06 01:19 UTCEG score recompute
  57. 2026-08-06 01:19 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  58. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  60. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  61. 2026-08-04 00:30 UTCEG score recompute
  62. 2026-08-04 00:30 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  63. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  64. 2026-08-02 15:59 UTCEG score recompute▲ 2.50
  65. 2026-08-02 15:59 UTCGHSA enrichmentGHSA-33x2-ppm4-v46v · GitHub CVSS 5.3
  66. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  67. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  68. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  69. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  70. 2026-07-28 15:37 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  71. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  72. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  73. 2026-07-24 14:18 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  74. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  75. 2026-07-23 03:16 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-4538?
CVE-2026-4538 is a high-severity vulnerability; its CVE record was published on March 22, 2026. A vulnerability was identified in PyTorch 2.10.0. The affected element is an unknown function of the component pt2 Loading Handler. The manipulation leads to deserialization. The attack can only be performed from a local environment. The exploit is publicly available and might be used. The project…
When was the CVE record for CVE-2026-4538 published?
The CVE record for CVE-2026-4538 was published on March 22, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-4538 actively exploited?
CVE-2026-4538 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4538?
CVE-2026-4538 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-4538?
A fix for CVE-2026-4538 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Dependency Blast Radius

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