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Advisory record · GHSA-r56g-q4p6-m3p6

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

CVSS 8.6 HighEPSS 0.0041 · 35th percentile

Published by the GitHub Advisory Database at 17 Sept 2026, 17:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.kestra:coreMaven<=1.3.31No fixed version yet
io.kestra:kestra-coreMaven<2.0.02.0.0
Identifiers
GHSA-r56g-q4p6-m3p6 · CVE-2026-73247
Weakness (CWE)
CWE-918
Tags
Published
17 Sept 2026
Updated
17 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Two Maven packages are affected and they could be confused, so I name both. The io.kestra:core package is affected through version 1.3.31 with no fixed version listed, and io.kestra:kestra-core is affected below 2.0.0 and fixed in 2.0.0. An unauthenticated attacker who can import and run a crafted flow can make the Pebble http() function request internal services, cloud metadata endpoints, or localhost, and read the responses. Upgrade io.kestra:kestra-core to 2.0.0 or later.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0041, the 35th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.