Is CVE-2026-40564 in the CISA KEV catalog?

No. CVE-2026-40564 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40564?

CVE-2026-40564 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-40564?

CVE-2026-40564 has an EPSS score of 0.49% (39th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40564?

Upgrade flink kubernetes operator to 1.15.0 or later.

CVE & CISA-KEV Catalog

CVE-2026-40564

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-552 CWE-918Server-Side Request Forgery (SSRF)

How to fix

Remediation Available

flink kubernetes operatorNVD

Affected:>= 1.3.0, < 1.15.0Fixed in:1.15.0CVE-2026-40564derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.49%probability of exploitation in 30 days

39thpercentile

Low risk: more likely to be exploited than 39% of all known CVEs.

References

Third-Party Advisory1

openwall.com

Mailing List1

lists.apache.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-02.