CVE-2026-88964 Integer overflow in OpenVPN
High 7.1
Published
Updated
Check this codebase for CVE-2026-88964 and fix it if it is affected.
What it is: CVE-2026-88964 is a high-severity vulnerability in OpenVPN, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-88964 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-2026-88964/ (Markdown: https://insights.sbomify.com/CVE-2026-88964/index.md)
Remote authenticated servers can cause denial of service or memory disclosure in OpenVPN clients via crafted domain search options exploiting an integer underflow.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-88964?
CVE-2026-88964 is a high-severity vulnerability in OpenVPN, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options
Which versions are affected by CVE-2026-88964?
How do I fix CVE-2026-88964?
Upgrade to a fixed version.
Is CVE-2026-88964 being exploited?
There is no known exploitation of CVE-2026-88964 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-88964, GHSA-wm7f-2ghj-7r8c.