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CVE-2026-40564

MediumPublished

Apache Flink Kubernetes Operator: Server-Side Request Forgery and local file access in Kubernetes Operator

Published: May 26, 2026
Updated: Jun 2, 2026
Assigning CNA: apache
Evidence observed: Aug 6, 2026

Primary CVSS

6.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

0.5%

Low · next 30 days

Percentile: 41.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Files or Directories Accessible to External Parties, Server-Side Request Forgery (SSRF) vulnerability in Apache Flink Kubernetes Operator. The FlinkSessionJob jarURI is currently not validated so that it points to user-owned files or addresses. This lets a user with CR create permissions read files from the operator pod's filesystem and pull content from any backing store reachable through Flink's pluggable filesystem layer and access them through the submitted Flink job. Furthermore for fetching from http/https addresses there is currently no allowlist on the URI scheme, no host check, no IP-range restriction, and no protection against pointing the URI at internal or link-local addresses.This issue affects Apache Flink Kubernetes Operator: from 1.3.0 before 1.15.0. Users are recommended to upgrade to version 1.15.0, which fixes the issue.

Sources

CVE-2026-40564PoC
CVE-2026-40564: SSRF via FlinkSessionJob jarURI in apache/flink-kubernetes-operator. Self-contained reproducer that runs on a local kind cluster with one make command.

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