# CVE-2026-20496: Information disclosure in MediaTek chipset

> A missing bounds check in MediaTek chipset firmware allows local attackers with System privileges to read out-of-bounds memory, disclosing sensitive information.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Aug 2026
- **Updated:** 3 Aug 2026
- **Also known as:** GHSA-rgfh-3wrp-q784

## What is CVE-2026-20496?

CVE-2026-20496 is a medium-severity vulnerability in MediaTek, Inc. MediaTek chipset, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In geniezone, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11036877; Issue ID: MSV-7132.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-20496?

It affects 17 products.


Products: Mediatek Mt6983 Firmware, Mediatek Mt8676 Firmware, Mediatek Mt8678 Firmware, Mediatek Mt8755 Firmware, Mediatek Mt8768 Firmware, Mediatek Mt8771 Firmware, Mediatek Mt8775 Firmware, Mediatek Mt8781 Firmware, Mediatek Mt8786 Firmware, Mediatek Mt8791t Firmware, Mediatek Mt8792 Firmware, Mediatek Mt8793 Firmware, Mediatek Mt8796 Firmware, Mediatek Mt8797 Firmware, Mediatek Mt8798 Firmware, Mediatek Mt8799 Firmware, Mediatek Mt8910 Firmware.

## How do I fix CVE-2026-20496?

No fix has been published for CVE-2026-20496 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20496 being exploited?

There is no known exploitation of CVE-2026-20496 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20496 and fix it if it is affected.

What it is: CVE-2026-20496 is a medium-severity vulnerability in MediaTek, Inc. MediaTek chipset, published on 3 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-2026-20496 in the wild and no public exploit code.

Affected product: MediaTek, Inc. MediaTek chipset. 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-2026-20496/ (Markdown: https://insights.sbomify.com/CVE-2026-20496/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20496
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20496
- OSV: https://osv.dev/vulnerability/CVE-2026-20496

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20496/
Summaries are generated and may contain mistakes; the official description above is the record.