---
cve: "CVE-2026-115921"
severity: "MEDIUM"
cvss: 6.2
epss: ""
vendor: "onnx"
kev: false
exploited: false
published: "2026-10-26 18:17:39"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-31T00:57:25+01:00"
---

# CVE-2026-115921

> 6.2 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-10-26 17:28:41
- CNA-CVSS: **6.2** (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-195** — Signed to Unsigned Conversion Error
  The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.
- **CWE-476** — NULL Pointer Dereference
  The product dereferences a pointer that it expects to be valid but is NULL.

## Patch verfügbar (OSV)

- 2bb50465112feca9003e1ed654d77f01ff1415ca (Commit)
- dd6bc92ea39fd2274fd671f0734b0b8b558356f5 (Commit)

## Referenzen

- <https://github.com/onnx/onnx/security/advisories/GHSA-m4pr-6v3c-6fgr>
- <https://github.com/onnx/onnx/pull/7916>
- <https://github.com/onnx/onnx/commit/dd6bc92ea39fd2274fd671f0734b0b8b558356f5>
- <https://github.com/onnx/onnx/releases/tag/v1.22.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-115921/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_