TI-2026-51384 Aliases CVE-2026-73247 GHSA-r56g-q4p6-m3p6

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

HIGH 76CWE-918Published 2026-08-11 · Updated 2026-08-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00406 35th percentileScored 2026-11-07

Fix Fixed kestra (kestra-io): 2.0.0io.kestra:kestra-core (Maven): 2.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Kestra	kestra	before 2.0.0	2.0.0	Patch available	CNA
—	io.kestra:core (Maven)	up to 1.3.31	—	No fix listed	GHSA-r56g-q4p6-m3p6
—	io.kestra:kestra-core (Maven)	before 2.0.0	2.0.0	Patch available	GHSA-r56g-q4p6-m3p6

kestra VendorKestra Affected before 2.0.0 Fixed in 2.0.0 Patch available CNA
io.kestra:core (Maven) Vendor— Affected up to 1.3.31 Fixed in — No fix listed GHSA-r56g-q4p6-m3p6
io.kestra:kestra-core (Maven) Vendor— Affected before 2.0.0 Fixed in 2.0.0 Patch available GHSA-r56g-q4p6-m3p6

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:kestra:kestra::::::::	—	—	Kestra

cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:* Versions — — ·Kestra

Remediation

Fix · CNA kestra (kestra-io) Fixed in 2.0.0
Fix · GHSA-r56g-q4p6-m3p6 io.kestra:kestra-core (Maven) Fixed in 2.0.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-73247
2026-10-03 Alias added: GHSA-r56g-q4p6-m3p6

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-73247

Other 2

TI-2026-36769 Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter` KEVCVSS 3.1CRITICAL 10.0
TI-2026-38637 Kestra: Unauthenticated RCE via /configs path-suffix auth-filter bypass CVSS 3.1CRITICAL 10.0
TI-2026-28138 Kestra v1.3.3 and before is vulnerable to SQL Injection. CVSS 3.1CRITICAL 9.8
TI-2026-26858 Kestra: Remote Code Execution via SQL Injection CVSS 3.1CRITICAL 10.0
TI-2026-39775 Kestra BasicAuth Password Stored as SHA-512 Enables Offline Brute-Force Attack CVSS 3.1HIGH 8.7
TI-2026-51383 Kestra: Unauthenticated management `/worker` endpoint exposes live task configuration and plaintext credentials CVSS 3.1HIGH 7.5

See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences