EUVD-2026-57013Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Network-facing unauthenticated API with no special conditions; S:C and C:H reflect SSRF pivot to cloud IMDS and internal services beyond Kestra's own trust boundary.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Lifecycle Timeline
3DescriptionCVE.org
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 link-local destinations, allowing an unauthenticated attacker to import and execute a flow that accesses internal services or cloud metadata.
AnalysisAI
Server-side request forgery in Kestra's Pebble http() template function allows unauthenticated remote attackers to force the Kestra server to make outbound HTTP requests to private, loopback, or link-local addresses - including cloud Instance Metadata Service endpoints - by supplying a crafted URI inside an imported workflow flow. All Kestra releases prior to 2.0.0 are affected, with no scope restriction on reachable internal hosts, making cloud-hosted deployments particularly exposed to IAM credential theft via AWS/GCP/Azure IMDS APIs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker can import and execute a flow containing a http() Pebble template call against the target Kestra instance. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 8.6 with vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N accurately characterizes the exploitation barrier: no authentication, no special preconditions, single network-reachable API call. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to a Kestra instance crafts a YAML or JSON flow definition that invokes the Pebble http() function with the URI http://169.254.169.254/latest/meta-data/iam/security-credentials/ and imports it via the Kestra flow API without credentials. Kestra's server-side HTTP client fetches the AWS IMDS endpoint, and the response - containing temporary IAM role credentials including access key, secret, and session token - is returned to the attacker through the flow execution output, enabling lateral movement and privilege escalation across the cloud environment. … |
| Remediation | Upgrade Kestra to version 2.0.0 or later, which introduces SSRF protections in the http() Pebble function restricting URI destinations away from private, loopback, and link-local address space. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, upgrade all Kestra deployments to version 2.0.0 or later and restart services to close the SSRF vulnerability. …
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External POC / Exploit Code
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