Live › vulnerability › CVE-2026-20556
A missing bounds check in the modem firmware allows an out-of-bounds write. A phone or device that connects to an attacker-controlled rogue base station can be pushed to escalate privilege remotely, with no user interaction.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-11-02 03:31 UTC. All times on this page are UTC.
Phones, tablets and other devices built on the MediaTek chipsets listed in the November 2026 MediaTek bulletin (for example MT6878, MT6985, MT6991, MT2735). Exposure needs the device to connect to an attacker-run rogue base station; no user interaction is needed. Devices without a MediaTek modem, or without cellular, can skip it.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| MediaTek modem chipsets | vendor | 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, MT6897, MT6899, MT6980, MT6982, MT6983, MT6985, MT6986, MT6988, MT6989, MT6990, MT6991, MT6993, MT8668, MT8676, MT8678, MT8755, MT8771, MT8775, MT8791, MT8791T, MT8792, MT8793, MT8796, MT8797, MT8798, MT8863, MT8873, MT8875, MT8883, MT8893 | – |
s chipset (Settings > About phone, or the makers spec sheet) and compare with the chipsets in the MediaTek November 2026 bulletins security update dated 2026-11-01 or later is installed; MediaTeks bulletin does not name the patch level, so ask the maker which build carries MOLY01876662Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01876662; Issue ID: MSV-9833.
This page as .md · .json · in your agent: get_signal("CVE-2026-20556")
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