CVE-2026-40564: Files or Directories Accessible to External Parties, Server-Side Request Forgery (SSRF) vulnerability in Apach

This month

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-40564 is a medium-severity flaw (CVSS 6.5) affecting flink kubernetes operator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 thro

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-552, CWE-918
Published	2026-05-26
Last modified	2026-07-24

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-26 16:16 UTCPublished CVE record published
2026-07-24 11:10 UTCUpdated Record last modified

apache flink kubernetes operator UPGRADE

Affected: >= 1.3.0 and < 1.15.0

Fixed in: 1.15.0

Safe to downgrade to: a release before 1.3.0

1. Check installed version

apt-cache policy flink-kubernetes-operator || rpm -q flink-kubernetes-operator || flink-kubernetes-operator --version

2. UPGRADE to 1.15.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flink-kubernetes-operator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flink-kubernetes-operator

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.3.0 (Debian / Ubuntu)

apt-cache madison flink-kubernetes-operator sudo apt install flink-kubernetes-operator=<VERSION_BEFORE_1.3.0> sudo apt-mark hold flink-kubernetes-operator

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list flink-kubernetes-operator sudo dnf downgrade flink-kubernetes-operator-<VERSION_BEFORE_1.3.0> sudo dnf versionlock add flink-kubernetes-operator

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40564?

flink kubernetes operator: upgrade to 1.15.0. Exact commands for each OS are on this page.

Is CVE-2026-40564 being exploited?

CVE-2026-40564 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40564 affect?

CVE-2026-40564 affects flink kubernetes operator. Severity is medium (CVSS 6.5). 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 addre

How urgent is CVE-2026-40564?

Priority 41/100. On your watchlist

Software pages

Kubernetes vulnerabilities

References

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