Out-of-bounds Read in Onnx
CVE-2026-115919
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to 1.22.0, RNNShapeInference_opset1_to_6() processes malformed RNN and LSTM nodes from opsets 1 through 6 and GRU nodes from opsets 3 through 6 without verifying that the first input has rank three. The function accesses dim(0) and dim(1) on an undersized protobuf shape, which can read outside the intended repeated field and terminate an application when onnx.shape_inference.infer_shapes() processes an untrusted model that can pass onnx.checker.check_model(). This issue is fixed in version 1.22.0.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Onnx — versions < 1.22.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-115919?
- CVE-2026-115919 is a medium-severity vulnerability in Onnx, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2026-10-26.
- How severe is CVE-2026-115919?
- Medium severity. CVSS v3 base score is 6.2 out of 10.