CVE-2026-67427: Flyto2 Core: ${env.VAR} interpolation reads any env secret despite env.get being denylisted

Severity: high (CVSS 8.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% 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-522

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 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-hr7p-wg7r-hg9m
https://github.com/flytohub/flyto-core/security/advisories/GHSA-hr7p-wg7r-hg9m

Get alerted when CVE-2026-67427 or the next vulnerability affects your stack