CVE-2026-40564

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

State: Published
Severity: 6.5 Medium
Published: May 26, 2026
Updated: Jun 2, 2026
Reserved: Apr 14, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-552 Files or Directories Accessible to External Parties
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
Apache Flink Kubernetes OperatorApache Software Foundation	1.3.0 to before 1.15.0Affected

References

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