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CVE-2026-34446— ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load

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onnx.load检查符号链接以防止路径遍历，但完全忽略了硬链接，因为硬链接在文件系统上看起来与常规文件完全相同。

CVSS 4.7 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1565.002 · Transmitted Data Manipulation
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I. Basic Information for CVE-2026-34446

Vulnerability Information
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Vulnerability Title
ONNX: Arbitrary File Read via ExternalData Hardlink Bypass in ONNX load
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 an issue in onnx.load, the code checks for symlinks to prevent path traversal, but completely misses hardlinks because a hardlink looks exactly like a regular file on the filesystem. This issue has been patched in version 1.21.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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onnx.load检查符号链接以防止路径遍历，但完全忽略了硬链接，因为硬链接在文件系统上看起来与常规文件完全相同。
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-2026-34446

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III. Intelligence Information for CVE-2026-34446

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Patches & Fixes for CVE-2026-34446 (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-2026-34447 5.5 MEDIUM ONNX: External Data Symlink Traversal
CVE-2026-27489 ONNX: Path Traversal via Symlink

IV. Related Vulnerabilities

Same product: onnx
Same vendor: onnx
Same weakness: CWE-22

V. Comments for CVE-2026-34446

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