# CVE-2026-39929: Lakeside SysTrack Agent LsiAgent.exe Out-of-Bounds Read via UDP

> Remote attackers can crash the Lakeside SysTrack Agent by sending a specially crafted UDP packet, causing a denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 May 2026
- **Updated:** 29 May 2026
- **Also known as:** GHSA-96w5-xvg7-p24r

## What is CVE-2026-39929?

CVE-2026-39929 is a high-severity denial of service vulnerability in Lakeside Software, LLC. SysTrack Agent, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Lakeside SysTrack Agent versions prior to 11.2.1.28, 11.3.0.38, 11.4.0.24, 11.5.0.15 contain an out-of-bounds read vulnerability in the Command ID 30 UDP packet handler that allows remote attackers to crash the application by sending a specially crafted UDP packet. Attackers can send a malformed packet with an invalid memory address at offset 0x4 in the payload to trigger an access violation and cause a denial of service.

Weakness: CWE-754 (Improper Check for Unusual or Exceptional Conditions), CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-39929?


## How do I fix CVE-2026-39929?

No fix has been published for CVE-2026-39929 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-39929 being exploited?

There is no known exploitation of CVE-2026-39929 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-39929 and fix it if it is affected.

What it is: CVE-2026-39929 is a high-severity denial of service vulnerability in Lakeside Software, LLC. SysTrack Agent, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-39929 in the wild and no public exploit code.

Affected product: Lakeside Software, LLC. SysTrack Agent. 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-2026-39929/ (Markdown: https://insights.sbomify.com/CVE-2026-39929/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-39929
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-39929
- OSV: https://osv.dev/vulnerability/CVE-2026-39929

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-39929/
Summaries are generated and may contain mistakes; the official description above is the record.