# CVE-2026-21399: Memory corruption in Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R)

> A heap-based buffer overflow in the Intel Open VKL library allows a local attacker to cause a denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N`)
- **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:** 11 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-89w3-r78p-gf49

## What is CVE-2026-21399?

CVE-2026-21399 is a medium-severity memory corruption vulnerability in Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R), published on 11 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (low) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-21399?

It affects 1 product.


Products: Intel Open Vkl.

## How do I fix CVE-2026-21399?

No fix has been published for CVE-2026-21399 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21399 being exploited?

There is no known exploitation of CVE-2026-21399 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21399 and fix it if it is affected.

What it is: CVE-2026-21399 is a medium-severity memory corruption vulnerability in Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R), published on 11 Aug 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-2026-21399 in the wild and no public exploit code.

Affected product: Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R). 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-2026-21399/ (Markdown: https://insights.sbomify.com/CVE-2026-21399/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21399
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21399
- OSV: https://osv.dev/vulnerability/CVE-2026-21399

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-21399/
Summaries are generated and may contain mistakes; the official description above is the record.