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TI-2026-80526 Aliases CVE-2026-115921GHSA-m4pr-6v3c-6fgr

Null pointer dereference in ONNX Scan shape inference

Priority LOW 27CWE-195Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-476.

Summary

ONNX from 1.4.0 before 1.22.0 does not validate the required num_scan_inputs attribute in ScanInferenceFunction. A missing attribute is dereferenced as a null pointer (CWE-476), and a negative value is converted to an unsigned size that reaches an oversized allocation path. A local attacker with no privileges and no user interaction can supply an untrusted model that crashes or disrupts shape inference, including a negative-value model that passes onnx.checker.check_model().

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.4.0 until 1.22.0, ScanInferenceFunction, ScanInferenceFunction_opset8, and ScanInferenceFunction_opset9 do not safely validate the required num_scan_inputs attribute. A missing attribute is dereferenced as a null pointer, while a negative value is converted to size_t and can reach an exceptional oversized allocation path. An untrusted model can therefore terminate or disrupt shape inference, including a negative-value model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00131 2nd percentileScored 2026-11-07
Fix Partial onnx (onnx): 1.22.0onnx (PyPI): 1.22.0Red Hat: 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
onnxonnx1.4.0 to before 1.22.01.22.0Patch availableCNA
—onnx (PyPI)1.4.0 to before 1.22.01.22.0Patch availableGHSA-m4pr-6v3c-6fgr
  • onnx Vendoronnx Affected 1.4.0 to before 1.22.0 Fixed in 1.22.0 Patch available CNA
  • onnx (PyPI) Vendor— Affected 1.4.0 to before 1.22.0 Fixed in 1.22.0 Patch available GHSA-m4pr-6v3c-6fgr

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:onnx:*:*:*:*:*:*:*:*——backstage
  • cpe:2.3:a:linuxfoundation:onnx:*:*:*:*:*:*:*:* Versions — — ·backstage

Remediation

Upgrade the onnx package to version 1.22.0 or later, which fixes the issue. Red Hat OpenShift AI (RHOAI) is affected, and the sources list no fixed version for it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

  • Fix · CNA onnx (onnx) Fixed in 1.22.0
  • Fix · GHSA-m4pr-6v3c-6fgr onnx (PyPI) Fixed in 1.22.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-115921
  2. 2026-10-27 Affected versions changed · Red Hat
  3. 2026-10-27 CVSS score added · Red Hat
  4. 2026-10-27 Priority changed: MEDIUM → LOW
  5. 2026-10-28 Alias added: GHSA-m4pr-6v3c-6fgr
  6. 2026-10-28 Fix available: PyPI/[email protected] · GHSA-m4pr-6v3c-6fgr
  7. 2026-10-28 CVSS score added · GHSA-m4pr-6v3c-6fgr
  8. 2026-10-28 Weakness changed · GHSA-m4pr-6v3c-6fgr
  9. 2026-10-28 6 new references · GHSA-m4pr-6v3c-6fgr
  10. 2026-10-31 CISA SSVC decision points changed

References

Advisory 1

Other 5

  • TI-2026-22763 ONNX Untrusted Model Repository Warnings Suppressed by silent=True in onnx.hub.load() — Silent Supply-Chain Attack CVSS 3.1CRITICAL 9.1
  • TI-2026-21896 ONNX: Path Traversal via Symlink CVSS 4.0HIGH 8.7
  • TI-2024-07209 Arbitrary File Overwrite in onnx/onnx CVSS 3.1CRITICAL 9.1
  • TI-2024-04814 Arbitrary File Overwrite in download_model_with_test_data in onnx/onnx CVSS 3.1HIGH 8.8
  • TI-2026-36338 ONNX symlink-following and path-traversal arbitrary file write CVSS 4.0MEDIUM 6.8
  • TI-2026-32442 ONNX: Null Pointer Dereference in Upsample Version Converter Adapter (Zero Inputs) CVSS 3.1MEDIUM 5.5
See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences