CVE-2026-73247

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

At a glance

Severity: HIGH 8.6
EPSS: EPSS 0.41 % · percentile 35 (2026-10-27)
State: PUBLISHED
Published: 2026-08-11
Updated: 2026-08-13
Assigner: GitHub_M
NVD status: Awaiting Analysis

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	GitHub_M
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

CWE-918

Advisories

GHSA-r56g-q4p6-m3p6 — Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata

European references

ENISA EUVD · EUVD-2026-57013
GCVE · GCVE-0-2026-73247

Affected products

Product	Versions
kestra-io · kestra	affected < 2.0.0

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD