GHSA-R56G-Q4P6-M3P6 Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata

Summary The Pebble template engine's http function in Kestra OSS accepts user-controlled URLs without any validation, allowing Server-Side Request Forgery SSRF attacks. An unauthenticated attacker can import a malicious Flow YAML and execute it to access internal services, cloud metadata endpoint...

CVE-2026-73247 Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata

Kestra is an open-source, event-driven orchestration platform. Prior to 2.0.0, Kestra's core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java passes the user-controlled http uri argument to URI.create and the server-side HTTP client without restricting private, loopback, or...

CVE-2026-73247 Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata

Kestra is an open-source, event-driven orchestration platform. Prior to 2.0.0, Kestra's core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java passes the user-controlled http uri argument to URI.create and the server-side HTTP client without restricting private, loopback, or...

CVE-2026-73247 Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata

Kestra is an open-source, event-driven orchestration platform. Prior to 2.0.0, Kestra's core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java passes the user-controlled http uri argument to URI.create and the server-side HTTP client without restricting private, loopback, or...

CVE-2026-73247

Kestra prior to 2.0.0 has a SSRF-like issue in HttpFunction.java: the user-controlled http() URI is passed to URI.create() and used by the server-side HTTP client without restricting private, loopback, or link-local destinations. This allows an unauthenticated attacker to import and execute a flo...