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CVE-2026-67427 is an information disclosure vulnerability in Flyto2 Core, an execution kernel for automation and AI-agent workflows. In versions prior to 2.26.6, the workflow engine's variable resolver expands ${env.VAR} expressions against arbitrary host environment variables without enforcing an allowlist or capability policy check. As a result, workflow-supplied parameters or step values can bypass the default capability policy restrictions intended to block environment access through env.get and env.load_dotenv. This creates an alternate path to sensitive process environment data and allows secrets to be exposed through otherwise permitted workflow modules, results, or traces.
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env.get and env.load_dotenv as a sufficient protection boundary. Prevent untrusted users, workflows, agents, API clients, or MCP-exposed inputs from supplying ${env.*} expressions or other interpolated values. Restrict or disable workflow and API paths that accept untrusted parameter interpolation, minimize storage of sensitive secrets in process environment variables, and constrain outbound-capable modules and network egress to reduce opportunities for secret exfiltration.Patch, then assume compromise.
flyto-core package to version 2.26.7 or later. In addition to upgrading, the resolver should enforce the same deny-by-default policy and explicit allowlist model for ${env.*} interpolation that applies to direct environment access APIs, or remove implicit environment interpolation entirely and require explicit environment passing at workflow start.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
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