Vulnerability · Published Jul 29, 2026 · Assigned by GitHub_M
CVE-2026-67427Flyto2 Core: ${env.VAR} interpolation reads any env secret despite env.get being denylisted
High 8.6
In plain English
A high-severity security flaw in flyto-core from flytohub. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Flyto2 Core is an execution kernel for automation and AI-agent workflows. Prior to 2.26.6, the workflow engine variable resolver expands ${env.VAR} for any host environment variable without an allowlist or capability policy check, allowing a workflow parameter to bypass the default capability policy denylist for env.get and env.load_dotenv and exfiltrate secrets through allowed modules. This issue is fixed in version 2.26.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | flyto-core | 2.26.7 | GHSA-hr7p-wg7r-hg9m |
| PyPI | flyto-core | 2.26.7 | PYSEC-2026-3570 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| flytohub | flyto-core | < 2.26.6 |
Weakness: CWE-522, CWE-668, CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N