CVE-2026-73247 Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata
Unauthenticated attackers can exploit SSRF in Kestra to access internal services and cloud metadata via the http() function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-73247?
CVE-2026-73247 is a high-severity server-side request forgery vulnerability in kestra-io kestra, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-73247?
4 open source packages ship an affected version, including io.kestra:core and io.kestra:kestra-core.
| Package | Affected | Fixed in |
|---|---|---|
io.kestra:core Maven | All versions to 1.3.31 | None |
io.kestra:core Maven | All versions to 1.3.31 | None |
io.kestra:kestra-core Maven | All versions | 2.0.0 |
io.kestra:kestra-core Maven | All versions | 2.0.0 |
How do I fix CVE-2026-73247?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73247 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73247 exists.
Sources
Also known as GHSA-r56g-q4p6-m3p6.