Quick answers
- Is CVE-2026-20578 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20578 being exploited in the wild.
- How severe is CVE-2026-20578?
- Informational severity, published 2 November 2026.
- Which products and versions are affected?
- MediaTek 5G Modem; MediaTek Helio 4G; MediaTek Dimensity 5G.
- Is there a fix for CVE-2026-20578?
- 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-2026-20578 attacked?
- It is attacked over the network or from the adjacent network, in device firmware.
- Am I affected by CVE-2026-20578?
- Check whether you run MediaTek 5G Modem, MediaTek Dimensity 5G or MediaTek Helio 4G. 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
This is a side-channel information disclosure vulnerability in MediaTek modem firmware affecting 5G and 4G modem implementations. The vulnerability can be exploited remotely when a user equipment (UE) connects to an attacker-controlled base station, allowing extraction of sensitive timing or power analysis information. The attack requires network-adjacent positioning but does not require authentication or user interaction.
Affected products
- MediaTek 5G Modem
- MediaTek Helio 4G
- MediaTek Dimensity 5G
Timeline
- 2026-11-02: disclosed