# CVE-2026-26932: Improper Validation of Array Index in Packetbeat Leading to Denial of Service

> An attacker can cause a denial of service in Packetbeat by sending crafted packets to the PostgreSQL protocol parser, requiring explicit configuration.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Feb 2026
- **Updated:** 26 Feb 2026
- **Also known as:** GHSA-fg9r-q7mv-mcrw

## What is CVE-2026-26932?

CVE-2026-26932 is a medium-severity denial of service vulnerability in Elastic Packetbeat, published on 26 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper Validation of Array Index (CWE-129) in the PostgreSQL protocol parser in Packetbeat can lead Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted packet causing a Go runtime panic that terminates the Packetbeat process. This vulnerability requires the pgsql protocol to be explicitly enabled and configured to monitor traffic on the targeted port.

Weakness: CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2026-26932?

It affects 1 product.


Products: Elasticsearch Packetbeat.

## How do I fix CVE-2026-26932?

No fix has been published for CVE-2026-26932 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-26932 being exploited?

There is no known exploitation of CVE-2026-26932 in the wild and no public exploit code.

## Other vulnerabilities in Elastic Packetbeat

- [CVE-2017-11480](https://insights.sbomify.com/CVE-2017-11480/): Denial of Service in Packetbeat (high 7.5)
- [CVE-2025-68381](https://insights.sbomify.com/CVE-2025-68381/): Packetbeat Improper Bounds Check (medium 6.5)
- [CVE-2025-68382](https://insights.sbomify.com/CVE-2025-68382/): Packetbeat Out-of-bounds Read (medium 6.5)
- [CVE-2026-26933](https://insights.sbomify.com/CVE-2026-26933/): Improper Validation of Array Index in Packetbeat Leading to Denial of Service (medium 5.7)
- [CVE-2025-68388](https://insights.sbomify.com/CVE-2025-68388/): Elasticsearch Packetbeat has Excessive Allocation of Memory and CPU via Malicious IPv4 Fragments (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-26932 and fix it if it is affected.

What it is: CVE-2026-26932 is a medium-severity denial of service vulnerability in Elastic Packetbeat, published on 26 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-26932 in the wild and no public exploit code.

Affected product: Elastic Packetbeat. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-26932/ (Markdown: https://insights.sbomify.com/CVE-2026-26932/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-26932
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-26932
- OSV: https://osv.dev/vulnerability/CVE-2026-26932

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-26932/
Summaries are generated and may contain mistakes; the official description above is the record.