# CVE-2026-21381: Buffer Over-read in WLAN Firmware

> A buffer over-read in Qualcomm Snapdragon WLAN firmware allows transient denial of service when processing malformed service data frames.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-hvr6-7x95-4jgj

## What is CVE-2026-21381?

CVE-2026-21381 is a high-severity denial of service vulnerability in Qualcomm Ar8035 Firmware, published on 6 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Transient DOS when receiving a service data frame with excessive length during device matching over a neighborhood awareness network protocol connection.

Weakness: CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2026-21381?

It affects 103 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Cologne Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Fwa Gen 3 Ultra Firmware, Qualcomm G2 Gen 1 Firmware, Qualcomm Milos Firmware, Qualcomm Netrani Firmware, Qualcomm Orne Firmware, Qualcomm Palawan25 Firmware, Qualcomm Pandeiro Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6698au Firmware, Qualcomm Qca6777aq Firmware, Qualcomm Qca6787aq Firmware, Qualcomm Qca6797aq Firmware, Qualcomm Qca8081 Firmware, Qualcomm Qca8337 Firmware and 83 more.

## How do I fix CVE-2026-21381?

No fix has been published for CVE-2026-21381 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21381 being exploited?

There is no known exploitation of CVE-2026-21381 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Ar8035 Firmware

- [CVE-2023-33106](https://insights.sbomify.com/CVE-2023-33106/): Qualcomm Multiple Chipsets Use of Out-of-Range Pointer Offset (high 8.4, exploited in the wild)
- [CVE-2024-45569](https://insights.sbomify.com/CVE-2024-45569/): Improper Validation of Array Index in WLAN Host Communication (critical 9.8)
- [CVE-2024-21473](https://insights.sbomify.com/CVE-2024-21473/): Improper Input Validation in WIN SON (critical 9.8)
- [CVE-2023-28582](https://insights.sbomify.com/CVE-2023-28582/): Buffer Copy Without Checking Size of Input in Data Modem (critical 9.8)
- [CVE-2023-43552](https://insights.sbomify.com/CVE-2023-43552/): Use After Free in WLAN Host Communication (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21381 and fix it if it is affected.

What it is: CVE-2026-21381 is a high-severity denial of service vulnerability in Qualcomm Ar8035 Firmware, published on 6 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-21381 in the wild and no public exploit code.

Affected product: Qualcomm Ar8035 Firmware. 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-2026-21381/ (Markdown: https://insights.sbomify.com/CVE-2026-21381/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21381
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21381
- OSV: https://osv.dev/vulnerability/CVE-2026-21381

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-21381/
Summaries are generated and may contain mistakes; the official description above is the record.