Is CVE-2026-20586 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-20586 being exploited in the wild.

How severe is CVE-2026-20586?

High severity, with a CVSS score of 8.8, published 5 October 2026.

Which products and versions are affected?

MediaTek Dimensity chipsets MT2716, MT2735, MT2737, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, MT6881, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6896.

Is there a fix for CVE-2026-20586?

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-2026-20586 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-20586?

Check whether you run MediaTek Dimensity chipsets at an affected version. 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.

CVE-2026-20586: MediaTek vdec out of bounds write

CVE-2026-20586 · Severity: high · CVSS 8.8 · Published 2026-10-05

MediaTek's vdec component, used in smartphone and IoT chipsets for video decoding, contains a missing bounds check that allows an out-of-bounds write. An attacker could exploit this during video playback to escalate privileges and take control of the device, requiring only user interaction such as opening a malicious video file.

Vendors: MediaTek.

Quick answers

Is CVE-2026-20586 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-20586 being exploited in the wild.
How severe is CVE-2026-20586?: High severity, with a CVSS score of 8.8, published 5 October 2026.
Which products and versions are affected?: MediaTek Dimensity chipsets MT2716, MT2735, MT2737, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, MT6881, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6896.
Is there a fix for CVE-2026-20586?: 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-2026-20586 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-20586?: Check whether you run MediaTek Dimensity chipsets at an affected version. 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 an out-of-bounds write (CWE-787) in the vdec (video decoder) component due to a missing bounds check. Exploitation requires user interaction (e.g., viewing malicious video content) but no additional execution privileges, and can lead to remote privilege escalation across multiple MediaTek chipsets. A patch is available via ALPS11383899.

Affected products

MediaTek Dimensity chipsets MT2716, MT2735, MT2737, MT6813, MT6815, MT6833, MT6835, MT6853, MT6855, MT6858, MT6873, MT6875, MT6877, MT6878, MT6879, MT6880, MT6881, MT6883, MT6885, MT6886, MT6889, MT6890, MT6891, MT6893, MT6895, MT6896

Timeline

2026-10-05: disclosed

References

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

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