CVE-2026-33466: Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file wr

This month

HIGH 8.1REMOTEUPGRADE

CVE-2026-33466 is a high-severity flaw (CVSS 8.1) affecting logstash. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file write and potentially remote code execution via Relative Path Traversal (CAPEC-139). The archive extraction utilities used by Logstash do not properly validate file paths within compressed archives. An attacker who can serve a specially crafted archive to Logstash through a compromised or attacker-controlled update endpoint can write arbitr

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): Elastic · Vendor: elastic

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

Am I affected?

Timeline

2026-04-08 18:26 UTCPublished CVE record published
2026-07-24 23:10 UTCUpdated Record last modified

elastic logstash UPGRADE

Affected: >= 8.0.0 and < 8.19.14 · >= 9.0.0 and < 9.2.8 · >= 9.3.0 and < 9.3.3

Fixed in: 8.19.14, 9.2.8, 9.3.3

Safe to downgrade to: a release before 8.0.0

1. Check installed version

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

2. UPGRADE to 8.19.14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade logstash

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 logstash sudo apt install logstash=<VERSION_BEFORE_8.0.0> sudo apt-mark hold logstash

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

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

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-2026-33466?

logstash: upgrade to 8.19.14, 9.2.8, 9.3.3. Exact commands for each OS are on this page.

Is CVE-2026-33466 being exploited?

CVE-2026-33466 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-2026-33466 affect?

CVE-2026-33466 affects logstash. Severity is high (CVSS 8.1). Improper Limitation of a Pathname to a Restricted Directory (CWE-22) in Logstash can lead to arbitrary file write and potentially remote code execution via Relative Path Traversal (CAPEC-139). The archive extraction utilities used by Logsta

How urgent is CVE-2026-33466?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

Kibana and Logstash vulnerabilities

References

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