# CVE-2026-20578: MediaTek Modem side-channel information disclosure

Source: https://junglewise.ai/threats/cve-2026-20578-in-modem-there-is-a-possible-information-disclosure-due-to-side  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-20578 · Severity: info · Published 2026-11-02

A vulnerability in MediaTek modem components allows attackers to extract sensitive information through side-channel analysis when a device connects to a rogue base station. This could enable denial of service or other attacks on devices using affected MediaTek modems. No special privileges or user interaction are required for exploitation.

Technologies: [MediaTek Dimensity 5G](https://junglewise.ai/threats/technologies/dimensity-5g), [MediaTek Helio 4G](https://junglewise.ai/threats/technologies/helio-4g). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## 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

## References

- [https://www.mediatek.com/product-security-bulletin/November-2026](https://www.mediatek.com/product-security-bulletin/November-2026)

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