High severity · published Apr 1, 2026
CVE-2026-27489
ONNX: Path Traversal via Symlink
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ON
onnx · onnx
< 1.21.0 · source: vendor, NVD
RH
Red Hat OpenShift AI (RHOAI) · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift AI 2.25 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27489
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-27489
Patch
https://github.com/onnx/onnx/commit/4755f8053928dce18a61db8fec71b69c74f786cb
Exploit
https://github.com/onnx/onnx/security/advisories/GHSA-3r9x-f23j-gc73
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:24977
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-27489
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2453929
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27489.json
More from onnx
9.1
CVE-2026-28500
ONNX Untrusted Model Repository Warnings Suppressed by silent=True in onnx.hub.load() — Silent Supply-Chain Attack
9.1
CVE-2024-7776
A vulnerability in the `download_model` function of the onnx/onnx framework, before and including version 1.16.1, allows for arbitrary file overwrite due to inadequate prevention…
8.6
CVE-2026-34445
ONNX: Malicious ONNX models can crash servers by exploiting unprotected object settings.
7.1
CVE-2026-49114
ONNX symlink-following and path-traversal arbitrary file write
6.2
CVE-2026-115922
ONNX: Denial of service via unchecked expansion of packed sub-byte tensors in ONNX Python APIs