CVE-2026-67429: Flyto2 Core: Arbitrary file write via image.download (and other file-writing modules)

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-29 · updated 2026-10-24
Weakness: CWE-22

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.

Affected products

flytohub flyto-core: before 2.26.6

References

https://github.com/flytohub/flyto-core/commit/d5f89d71303e3c1e6418d347c5c55fcd173cc8cc
https://github.com/flytohub/flyto-core/releases/tag/v2.26.6
https://github.com/flytohub/flyto-core/security/advisories/GHSA-2956-977x-2w3r
https://github.com/flytohub/flyto-core/security/advisories/GHSA-2956-977x-2w3r

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