ONNX: TOCTOU arbitrary file read/write in save_external_dat

SummaryThe saveexternaldata method seems to include multiple issues introducing a local TOCTOU vulnerability, an arbitrary file read/write on any system. It potentially includes a path validation bypass on Windows systems.Regarding the TOCTOU, an attacker seems to be able to overwrite victim's...

PYSEC-2026-3876 ONNX: TOCTOU arbitrary file read/write in save_external_dat

Summary The saveexternaldata method seems to include multiple issues introducing a local TOCTOU vulnerability, an arbitrary file read/write on any system. It potentially includes a path validation bypass on Windows systems. Regarding the TOCTOU, an attacker seems to be able to overwrite victim's...

CVE-2026-49114

A flaw was found in ONNX. The saveexternaldata function is vulnerable to symlink following and path traversal. A local attacker with write access to a directory where a victim serializes external data can exploit this by pre-planting a symlink. This allows the attacker to cause the victim's write...

Linux Distros Unpatched Vulnerability : CVE-2026-49114

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing...

Duplicate Advisory: ONNX: TOCTOU arbitrary file read/write in save_external_dat

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-q56x-g2fj-4rj6. This link is maintained to preserve external references. Original Description In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externalda...

CVE-2026-49114

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

UBUNTU-CVE-2026-49114

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

CVE-2026-49114

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

EUVD-2026-63995

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

CVE-2026-49114 ONNX symlink-following and path-traversal arbitrary file write

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

CVE-2026-49114 ONNX symlink-following and path-traversal arbitrary file write

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

CVE-2026-49114

ONNX before 1.21.0 is vulnerable to a symlink-following arbitrary file write in the save_external_data function. The function constructs the output path from the model's external_data location field and opens it for writing without O_NOFOLLOW/O_EXCL, relying on a non-atomic os.path.isfile() check...

CVE-2026-49114

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

CVE-2026-49114 ONNX symlink-following and path-traversal arbitrary file write

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...

ONNX symlink-following and path-traversal arbitrary file write

RISK EVALUATION 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/authorizedkeys, cron files, or...

CVE-2026-49114: Time-of-check Time-of-use (TOCTOU) Race Condition

In ONNX before 1.21.0, the 'saveexternaldata' function builds the external-data file path from the model's externaldata location field and opens it for writing without 'ONOFOLLOW/OEXCL', after a non-atomic 'os.path.isfile' check. A local attacker with write access to the directory where a victim...