CVE-2026-67429 Flyto2 Core: Arbitrary file write via image.download (and other file-writing modules)
Attackers can write arbitrary files to the filesystem via image.download due to missing path validation, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-67429?
CVE-2026-67429 is a critical path traversal vulnerability in flytohub flyto-core, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, image.download and related file-writing modules use caller-controlled output_dir instead of validate_path_with_env_config and its FLYTO_SANDBOX_DIR confinement, allowing attacker-controlled response bytes to be written to arbitrary filesystem paths the process can access. This issue is fixed in version 2.26.6.
Which versions are affected by CVE-2026-67429?
3 open source packages ship an affected version, including flyto-core.
| Package | Affected | Fixed in |
|---|---|---|
flyto-core PyPI | All versions | 2.26.7 |
flyto-core PyPI | All versions | 2.26.7 |
flyto-core PyPI | All versions | 2.26.7 |
How do I fix CVE-2026-67429?
Upgrade flyto-core to 2.26.7 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-67429 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67429 exists.
Sources
Also known as GHSA-2956-977x-2w3r, PYSEC-2026-3568.