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

High · CVSS 8.6CVE-2026-73247GHSA-R56G-Q4P6-M3P6

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

Answer in brief

CVE-2026-73247 records a High severity (CVSS 8.6) vulnerability in Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata. The current sources do not mark it as known exploited. The current feed maps kestra-io/kestra (generic), io.kestra:core (maven), io.kestra:core (maven), io.kestra:kestra-core (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 11, 2026Updated Sep 17, 2026Source checked Sep 26, 2026First seen by HOL Aug 11, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 5 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps kestra-io/kestra (generic), io.kestra:core (maven), io.kestra:core (maven), io.kestra:kestra-core (maven) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
kestra-io/kestrageneric	< 2.0.0	Not reported
io.kestra:coremaven	<=1.3.31	Not reported
io.kestra:coremaven	>=0	Not reported
io.kestra:kestra-coremaven	<2.0.0	2.0.0
io.kestra:kestra-coremaven	>=0 <2.0.0	2.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for kestra-io/kestra, io.kestra:core, io.kestra:core.
Review the reported fix. Update io.kestra:kestra-core to 2.0.0; io.kestra:kestra-core to 2.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.