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Fencer Vulns
high 8.6

CVE-2026-27489 json

ONNX: Path Traversal via Symlink

published 2026-03-31 7 mo ago modified 2026-11-04 5 d ago also EUVD-2026-17969 , GHSA-3r9x-f23j-gc73 , PYSEC-2026-2239

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi onnx 1.21.0
  • Red Hat Red Hat OpenShift AI 2.25 1780069146, 1780069222, 1780069226, 1780078312, 1780078388, 1780078413, 1780078414, 1780078416, 1780078429, 1780078629, 1780078632, 1780417775

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27489 updated cvss 8.6

onnx: ONNX: Information Disclosure via Path Traversal Vulnerability

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-openvino-model-server-rhel9
    affected: no fix available
  • Red Hat OpenShift AI 2.25 rhoai/odh-pipeline-runtime-pytorch-cuda-py312-rhel9 1780078429, rhoai/odh-pipeline-runtime-pytorch-rocm-py312-rhel9 1780078632, rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9 1780078413, rhoai/odh-workbench-jupyter-pytorch-rocm-py312-rhel9 1780078629, rhoai/odh-workbench-jupyter-trustyai-cpu-py312-rhel9 1780069222, rhoai/odh-pipeline-runtime-datascience-cpu-py312-rhel9 1780078312, +8 more
    fixed: vendor fix RHSA-2026:24977
  • Red Hat OpenShift AI 3.3 rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 1790076724, rhoai/odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 1789651389
    fixed: vendor fix RHSA-2026:73987
  • Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1780513840, rhoai/odh-vllm-cpu-rhel9 1780069252, rhoai/odh-dashboard-rhel9 1780467029, rhoai/odh-modelmesh-rhel9 1780069506, rhoai/odh-operator-bundle 1780514621, rhoai/odh-vllm-cuda-rhel9 1780069320, +57 more Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1790070206, rhoai/rhai-cli-rhel9 1790070206, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-trainer-rhel9 1790136369, rhoai/odh-maas-api-rhel9 1790131842, rhoai/odh-mlserver-rhel9 1789121365, +75 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/onnx/onnx/security/advisories/GHSA-3r9x-f23j-gc73 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CISA ADP 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 4.0 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi onnx
<1.21.0
1.21.0

Affected products

  • onnx onnx
  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness
  • CWE-23 Relative Path Traversal
  • CWE-61 UNIX Symbolic Link (Symlink) Following
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.