CVE-2026-78588: Allocation of Resources Without Limits or Throttling (CWE-770) in Filebeat can lead to a denial of service via

Routine

MEDIUM 6.5UPGRADE

CVE-2026-78588 is a medium-severity flaw (CVSS 6.5) affecting filebeat. 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 Filebeat can lead to a denial of service via Excessive Allocation (CAPEC-130). An attacker able to reach the Filebeat HTTP ingestion endpoint could send specially crafted compressed requests that exhaust the memory resources of the Filebeat process.

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 64%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-09-02
Last modified	2026-09-03

Publisher (CNA): Elastic · Vendor: elastic

Last updated 2026-09-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-02 15:17 UTCPublished CVE record published
2026-09-03 19:12 UTCUpdated Record last modified

elastic filebeat UPGRADE

Affected: >= 8.0.0 and < 8.19.18 · >= 9.0.0 and < 9.3.1

Fixed in: 8.19.18, 9.3.1

Safe to downgrade to: a release before 8.0.0

1. Check installed version

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

2. UPGRADE to 8.19.18 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade filebeat

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 8.0.0 (Debian / Ubuntu)

apt-cache madison filebeat sudo apt install filebeat=<VERSION_BEFORE_8.0.0> sudo apt-mark hold filebeat

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

dnf --showduplicates list filebeat sudo dnf downgrade filebeat-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add filebeat

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-2026-78588?

filebeat: upgrade to 8.19.18, 9.3.1. Exact commands for each OS are on this page.

Is CVE-2026-78588 being exploited?

CVE-2026-78588 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-2026-78588 affect?

CVE-2026-78588 affects filebeat. Severity is medium (CVSS 6.5). Allocation of Resources Without Limits or Throttling (CWE-770) in Filebeat can lead to a denial of service via Excessive Allocation (CAPEC-130). An attacker able to reach the Filebeat HTTP ingestion endpoint could send specially crafted com

How urgent is CVE-2026-78588?

Priority 32/100. No elevated risk signals yet.

References

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