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VulnerabilityPublished Updated

CVE-2026-40564: Apache Flink Kubernetes Operator · Exposed Files or Directories

Affects Apache Flink Kubernetes OperatorSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 1.15.0 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.15.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade Apache Flink Kubernetes Operator to 1.15.0.

Affected software

ProductAffectedFixed in
Apache Software FoundationApache Flink Kubernetes OperatorAffected
  • >=1.3.0 <1.15.0
Fixed in
  • 1.15.0
Mavenorg.apache.flink/flink-kubernetes-operatorpkg:maven/org.apache.flink/flink-kubernetes-operatorOther threatsAffected
  • =1.3.0
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade Apache Flink Kubernetes Operator to version 1.15.0 or later, where this vulnerability is fixed. No other official remediation or temporary fixes are indicated. Patch status is not explicitly stated but the vendor recommends upgrading to 1.15.0 to address the issue.

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.

References

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