CVE-2026-40564CWE-552CWE-918

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

Medium · published May 26, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
41.3
In the wild
Unconfirmed
What it is

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 record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00492 · 41.3th percentile
Weaknesses
CWE-552 · Files or Directories Accessible to External Parties; CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-05-26T14:38Z
EPSS history
Timeline
  • 26 MAY 14:38Z
    Apache Flink Kubernetes Operator: Server-Side Request Forgery and local file access in Kubernetes Operator
    cvelistv5