CVE-2026-40564Network attack vector

Data disclosure via unvalidated job artifact URI

Published May 26, 2026 · Updated May 26, 2026

SSRF and file disclosure in Apache Flink Kubernetes Operator 1.3.0 through 1.14.0 allow remote authenticated users to read reachable data. The FlinkSessionJob jarURI path accepts arbitrary filesystem and HTTP(S) URIs without ownership, scheme, host, or IP-range validation. Kubernetes custom-resource create permission is required; submitted jobs can expose operator-pod files or content reachable through Flink filesystems.

CVSS severity6.5
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF and file disclosure in Apache Flink Kubernetes Operator 1.3.0 through 1.14.0 allow remote authenticated users to read reachable data. The FlinkSessionJob jarURI path accepts arbitrary filesystem and HTTP(S) URIs without ownership, scheme, host, or IP-range validation. Kubernetes custom-resource create permission is required; submitted jobs can expose operator-pod files or content reachable through Flink filesystems.

The record

CVE
CVE-2026-40564
Published
May 26, 2026
Updated
May 26, 2026
Vendor
The Apache Software Foundation
Product
Apache Flink Kubernetes Operator
Classifications
CWE-918, CWE-552, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.3.0 <1.15.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Flink Kubernetes Operatorversion=1.3.0 <1.15.0

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-552Files or Directories Accessible to External Parties
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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