# CVE-2026-84732: Integer overflow in OpenVPN

> Remote unauthenticated attackers can cause denial of service in OpenVPN by triggering an integer overflow via crafted ACK packet retransmissions.

- **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:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** ALPINE-CVE-2026-84732, CLSA-2026-1792649282, DEBIAN-CVE-2026-84732, GHSA-6r5j-cp22-59fv, OESA-2026-4095, OESA-2026-4096, OESA-2026-4097, SUSE-SU-2026:4242-1, UBUNTU-CVE-2026-84732

## What is CVE-2026-84732?

CVE-2026-84732 is a high-severity vulnerability in OpenVPN, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Retransmissions of ACK packet ID in OpenVPN through 2.6.22 and 2.7.6 allow remote unauthenticated attackers to cause a denial of service via crafted inputs that trigger a timeout integer overflow

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-84732?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `openvpn` | SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 2.3.8-16.38.1 |
| `openvpn` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 2.3.8-16.38.1 |

## How do I fix CVE-2026-84732?

Apply the vendor's patch.

## Is CVE-2026-84732 being exploited?

There is no known exploitation of CVE-2026-84732 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84732 and fix it if it is affected.

What it is: CVE-2026-84732 is a high-severity vulnerability in OpenVPN, published on 7 Sep 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-2026-84732 in the wild and no public exploit code.

Affected product: OpenVPN. 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-2026-84732/ (Markdown: https://insights.sbomify.com/CVE-2026-84732/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84732
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84732
- OSV: https://osv.dev/vulnerability/CVE-2026-84732

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84732/
Summaries are generated and may contain mistakes; the official description above is the record.