CVE Catalog

CVE-2026-40564

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.49%

39th percentile - higher than 39% of all known CVEs

Summary

Files or Directories Accessible to External Parties, Server-Side Request Forgery (SSRF) vulnerability in Apache Flink Kubernetes Operator. The FlinkSessionJob jarURI is not validated, allowing a user with CR create permissions to read files from the operator pod's filesystem and pull content from any backing store reachable through Flink's pluggable filesystem layer. Additionally, there is no allowlist on the URI scheme, no host check, no IP-range restriction, and no protection against pointing the URI at internal addresses.

Risk Assessment

A user with CR create permissions can access sensitive data stored in the Kubernetes cluster or the operator's filesystem, and can perform SSRF attacks against internal services.

Recommendation

Upgrade Apache Flink Kubernetes Operator to version 1.15.0, which fixes the issue.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS