Quick answers
- Is CVE-2026-20478 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20478 being exploited in the wild.
- How severe is CVE-2026-20478?
- Medium severity, with a CVSS score of 5.5, published 3 August 2026.
- Which products and versions are affected?
- MediaTek MT6880 chipset; MediaTek MT6890 chipset; MediaTek MT6988 chipset; MediaTek MT6990 chipset; and 2 more.
- Is there a fix for CVE-2026-20478?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20478 attacked?
- It is attacked with local access, in device firmware.
- Am I affected by CVE-2026-20478?
- Check whether you run MediaTek MT2735, MediaTek MT2735 chipset, MediaTek Mt2735 Firmware or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a heap buffer overflow (CWE-787: Out-of-bounds Write) in the Audio HAL component affecting multiple MediaTek chipsets. The root cause is insufficient bounds checking that allows out-of-bounds memory writes. Exploitation requires local user-level execution privileges; network access is not required. An attacker with local access can trigger the vulnerability without user interaction to cause denial of service or potentially achieve code execution. MediaTek has released patches identified as ALPS10981454 (for MT6880, MT6890, MT6988, MT6990) and AUTO00851293 (for MT2735, MT2737).
Affected products
- MediaTek MT6880 chipset
- MediaTek MT6890 chipset
- MediaTek MT6988 chipset
- MediaTek MT6990 chipset
- MediaTek MT2735 chipset
- MediaTek MT2737 chipset
Timeline
- 2026-08-03: disclosed: MediaTek Product Security Bulletin published