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CVE-2026-34447— ONNX: External Data Symlink Traversal

Quick assessment

Affected
onnx onnx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open Neural Network Exchange是Open Neural Network Exchange开源的一个开放的生态系统，它使 AI 开发人员能够随着项目的发展选择合适的工具。 Open Neural Network Exchange 1.21.0之前版本存在安全漏洞，该漏洞源于外部数据加载中存在符号链接遍历，可能读取模型目录外的文件。

CVSS 5.5 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-34447

Vulnerability Information
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Vulnerability Title
ONNX: External Data Symlink Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, there is a symlink traversal vulnerability in external data loading allows reading files outside the model directory. This issue has been patched in version 1.21.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Open Neural Network Exchange 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Neural Network Exchange是Open Neural Network Exchange开源的一个开放的生态系统，它使 AI 开发人员能够随着项目的发展选择合适的工具。 Open Neural Network Exchange 1.21.0之前版本存在安全漏洞，该漏洞源于外部数据加载中存在符号链接遍历，可能读取模型目录外的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
onnx onnx < 1.21.0 -

II. Public POCs for CVE-2026-34447

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III. Intelligence Information for CVE-2026-34447

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Vendor Advisories for CVE-2026-34447 (1)

Same Patch Batch · onnx · 2026-04-01 · 4 CVEs total

CVE-2026-34445 8.6 HIGH ONNX: Malicious ONNX models can crash servers by exploiting unprotected object settings.
CVE-2026-34446 4.7 MEDIUM ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load
CVE-2026-27489 ONNX: Path Traversal via Symlink

IV. Related Vulnerabilities

Same product: onnx
Same vendor: onnx
Same weakness: CWE-61

V. Comments for CVE-2026-34447

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