Apache Flink Kubernetes Operator up to 1.14.x file access

Summaryinfo

A vulnerability labeled as problematic has been found in Apache Flink Kubernetes Operator up to 1.14.x. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to file access. This vulnerability is tracked as CVE-2026-40564. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Apache Flink Kubernetes Operator up to 1.14.x. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a file access vulnerability. The CWE definition for the vulnerability is CWE-552. The product makes files or directories accessible to unauthorized actors, even though they should not be. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The weakness was disclosed by Andrea Cosentino. The advisory is available at lists.apache.org. This vulnerability was named CVE-2026-40564 since 04/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/26/2026). This vulnerability is assigned to T1083 by the MITRE ATT&CK project.

Upgrading to version 1.15.0 eliminates this vulnerability.

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Productinfo

Type

• Virtualization Software

Vendor

• Apache

Name

• Flink Kubernetes Operator

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14

License

• open-source

Website

• Vendor: https://www.apache.org/

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