PacketbeatApplication · Elasticsearch
CVE-2026-26933
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper Validation of Array Index (CWE-129) in multiple protocol parser components in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker with the ability to send specially crafted, malformed network packets to a monitored network interface can trigger out-of-bounds read operations, resulting in application crashes or resource exhaustion. This requires the attacker to be positioned on the same network segment as the Packetbeat deployment or to control traffic routed to monitored interfaces.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidencePacketbeat contains improper array index validation (CWE-129) in multiple protocol parser components. Attackers on the same network segment or controlling routed traffic can send specially crafted malformed packets that trigger out-of-bounds read operations, causing application crashes or resource exhaustion leading to denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
PacketbeatApplication
>= 8.0.0, < 8.19.11>= 9.0.0, < 9.2.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Adjacent
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Packetbeat versionRun 'packetbeat version' command or inspect the installed package (e.g., dpkg -l packetbeat, rpm -qi packetbeat)Affected if Version is >= 8.0.0 and < 8.19.11, or >= 9.0.0 and < 9.2.5
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Confirm Packetbeat service is runningRun 'systemctl status packetbeat' or 'ps aux | grep packetbeat' to verify the service is activeAffected if Packetbeat is running and processing network traffic on monitored interfaces
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Identify monitored network interfacesReview /etc/packetbeat/packetbeat.yml or run 'packetbeat config output' to list interfaces being capturedAffected if Packetbeat is monitoring interfaces accessible to untrusted network segments (e.g., spanning tap ports, mirrored traffic from untrusted VLANs)
You are affected if Packetbeat is running a version within the affected ranges AND is actively capturing traffic on network segments accessible to untrusted attackers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped8.19.119.2.5
Update Packetbeat to the patched version when available, and implement network segmentation to restrict attacker access to monitored network interfaces.
8.19.11 (8.x branch) or 9.2.5 (9.x branch)
- 1. Back up current Packetbeat configuration and data directories
- 2. For Packetbeat 8.x: upgrade to version 8.19.11 or later
- 3. For Packetbeat 9.x: upgrade to version 9.2.5 or later
- 4. Verify the upgrade by running: packetbeat version
- 5. Restart the Packetbeat service
- 6. Monitor logs to confirm normal packet processing
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Packetbeat
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,080.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-26933 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-26933 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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