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HIGH

CVE-2026-49114

CVSS v3

7.1

HIGH

EPSS Score

0.2 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • onnxPyPIall versions · fixed in 1.21.0

Vendor advisories

  • CVE-2026-49114 Red Hat Product Security28 products fixed · 1 known affected

    onnx: ONNX: Arbitrary file write via symlink following and path traversal

    rhoai/odh-openvino-model-server-rhel9 as a component of Red Hat OpenShift AI (RHOAI)

  • RHSA-2026:84734 Red Hat Product Security28 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • VA-26-233-01 CISA1 product fixed · 1 known affected

    ONNX symlink-following and path-traversal arbitrary file write

    ONNX ONNX <1.21.0

Full record on NVD

Description

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Published
2026-08-21
Last Modified
2026-08-21

Frequently asked questions

What is CVE-2026-49114?

In ONNX before 1.21.0, the 'save_external_data' function builds the external-data file path from the model's external_data location field and opens it for writing without 'O_NOFOLLOW/O_EXCL', after a non-atomic 'os.path.isfile()' check. A local attacker with write access to the directory where a victim serializes external data can deterministically pre-plant a symlink that is being followed, causing the victim's write to append to any file the victim can write, e.g. ~/.ssh/authorized_keys, cron files, or application configs. Fixed in 1.21.0.

Is CVE-2026-49114 actively exploited?

Active exploitation of CVE-2026-49114 has not been confirmed. Its EPSS score was 0.2% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-49114?

CVE-2026-49114 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.

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