CVE-2026-40564

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.

PUBLISHED Reserved 2026-04-14 | Published 2026-05-26 | Updated 2026-06-02 | Assigner apache

Problem types

CWE-552 Files or Directories Accessible to External Parties

CWE-918 Server-Side Request Forgery (SSRF)

Product status

Credits

Andrea Cosentino finder

Andrea Cosentino remediation developer

References

www.openwall.com/lists/oss-security/2026/05/26/6

lists.apache.org/thread/jvxs2kh2o60sl7qkl5nss4r5phzfl4cz vendor-advisory

cve.org (CVE-2026-40564)

nvd.nist.gov (CVE-2026-40564)

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