---
cve: "CVE-2026-115920"
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: "2026-10-29T00:02:57+01:00"
---

# CVE-2026-115920

> 6.2 MEDIUM · 🧪 PoC

## Beschreibung

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. From 1.2.1 until 1.22.0, ConvTranspose shape inference processes a weight tensor with fewer than three dimensions without a kernel_shape attribute by deriving an empty effective_kernel_shape and indexing it for the input's spatial dimensions. The flaw affects convTransposeShapeInference_opset11() and the current inference path, and an untrusted model that can pass onnx.checker.check_model() can crash onnx.shape_inference.infer_shapes(), causing denial of service without demonstrated confidentiality or integrity impact. This issue is fixed in version 1.22.0.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-10-26 19:48:35
- CNA-CVSS: **6.2** (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **partial**

## 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-125** — Out-of-bounds Read
  The product reads data past the end, or before the beginning, of the intended buffer.

## Angriffsmuster (CAPEC)

- [CAPEC-540 — Overread Buffers](https://capec.mitre.org/data/definitions/540.html) _(Severity: High)_

## Patch verfügbar (OSV)

- 2bb50465112feca9003e1ed654d77f01ff1415ca (Commit)
- 2ec288908952eea9dcf48d4b197915e1f72c6abf (Commit)

## Referenzen

- <https://github.com/onnx/onnx/security/advisories/GHSA-6pwm-x34p-fvj2>
- <https://github.com/onnx/onnx/pull/7997>
- <https://github.com/onnx/onnx/commit/2ec288908952eea9dcf48d4b197915e1f72c6abf>
- <https://github.com/onnx/onnx/releases/tag/v1.22.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-115920/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_