CVE-2026-42397: Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via E

Routine

MEDIUM 6.5UPGRADE

CVE-2026-42397 is a medium-severity flaw (CVSS 6.5) affecting kibana. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user can submit a specially crafted request to affected Entity Analytics endpoints containing an oversized input value that causes excessive resource consumption, which may render Kibana unavailable.

Why this priority

No elevated risk signals yet

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	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): Elastic · Vendor: elastic

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 20:17 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

elastic kibana UPGRADE

Affected: >= 9.3.0 and < 9.3.7 · >= 9.4.0 and < 9.4.4

Fixed in: 9.3.7, 9.4.4

Safe to downgrade to: a release before 9.3.0

1. Check installed version

apt-cache policy kibana || rpm -q kibana || kibana --version

2. UPGRADE to 9.3.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kibana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kibana

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 9.3.0 (Debian / Ubuntu)

apt-cache madison kibana sudo apt install kibana=<VERSION_BEFORE_9.3.0> sudo apt-mark hold kibana

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

dnf --showduplicates list kibana sudo dnf downgrade kibana-<VERSION_BEFORE_9.3.0> sudo dnf versionlock add kibana

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-2026-42397?

kibana: upgrade to 9.3.7, 9.4.4. Exact commands for each OS are on this page.

Is CVE-2026-42397 being exploited?

CVE-2026-42397 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-2026-42397 affect?

CVE-2026-42397 affects kibana. Severity is medium (CVSS 6.5). Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user can submit a specially crafted request to affected Entity Analytics endpoin

How urgent is CVE-2026-42397?

Priority 32/100. No elevated risk signals yet.

Software pages

Kibana vulnerabilities

Related CVEs

CVE-2026-63139 MEDIUM 6.5 UPGRADE Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (
CVE-2026-56147 HIGH 7.1 UPGRADE Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized information disc
CVE-2026-56146 MEDIUM 5.4 UPGRADE Improper Access Control (CWE-284) in Kibana can lead to unauthorized modification of Entity Analytics Watchlis
CVE-2026-49092 MEDIUM 4.3 UPGRADE Unintended Proxy or Intermediary ('Confused Deputy') (CWE-441) in Kibana can lead to unauthorized information
CVE-2026-63260 MEDIUM 6.5 UPGRADE Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (

References

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