How severe is CVE-2026-27489?

CVE-2026-27489 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-27489 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27489?

CVE-2026-27489 affects Linuxfoundation Onnx. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27489?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27489 have an EU (EUVD) identifier?

Yes. CVE-2026-27489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17969.

When was CVE-2026-27489 published?

CVE-2026-27489 was published on 2026-04-01 and last updated on 2026-06-30.

CVE-2026-27489

CVE-2026-27489 is a high-severity vulnerability in Linuxfoundation Onnx with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-23.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17969
Weakness: CWE-23
Affected product: Linuxfoundation Onnx
Published: 2026-04-01
Last modified: 2026-06-30

Description

Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, a path traversal vulnerability via symlink allows to read arbitrary files outside model or user-provided directory. This issue has been patched in version 1.21.0.

Frequently asked questions

What is CVE-2026-27489?: Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0, a path traversal vulnerability via symlink allows to read arbitrary files outside model or user-provided directory. This issue has been patched in version 1.21.0.
How severe is CVE-2026-27489?: CVE-2026-27489 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-27489 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27489?: CVE-2026-27489 affects Linuxfoundation Onnx. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27489?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27489 have an EU (EUVD) identifier?: Yes. CVE-2026-27489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17969.
When was CVE-2026-27489 published?: CVE-2026-27489 was published on 2026-04-01 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:linuxfoundation:onnx:*:*:*:*:*:*:*:*

More vulnerabilities in Linuxfoundation Onnx

CVE-2025-51480 — High (CVSS 8.8): Path Traversal vulnerability in onnx.external_data_helper.save_external_data in ONNX 1.17.0 allows attackers to…
CVE-2024-5187 — High (CVSS 8.8): A vulnerability in the `download_model_with_test_data` function of the onnx/onnx framework, version 1.16.0, allows for…
CVE-2026-34445 — High (CVSS 8.6): Open Neural Network Exchange (ONNX) is an open standard for machine learning interoperability. Prior to version 1.21.0,…
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CVE-2022-25882 — High (CVSS 7.5): Versions of the package onnx before 1.13.0 are vulnerable to Directory Traversal as the external_data field of the…

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