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

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: 2026-08-11 · updated 2026-10-24
Weakness: CWE-918

Description

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.

Affected products

kestra-io kestra: before 2.0.0

References

https://github.com/kestra-io/kestra/security/advisories/GHSA-r56g-q4p6-m3p6
https://github.com/kestra-io/kestra/security/advisories/GHSA-r56g-q4p6-m3p6

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