A significant security vulnerability within the **Android** operating system has been revealed by **Google** in its November security bulletin. The flaw, identified as **CVE-2026-58868**, carries a Critical severity rating and poses a substantial risk to mobile device security.  ### The Remote Code Execution Vulnerability **CVE-2026-58868** affects **Android** versions 14 through 17. It is described as a possible out-of-bounds write stemming from a heap buffer overflow within the `onOutputReceived` function of the `FrameDecoder.cpp` file. While the exact method an attacker would use to reach this vulnerable code remains undisclosed in both the bulletin and the **CVE** record, the potential for remote code execution without user interaction makes this a high-priority threat. **Google**'s Critical rating for this vulnerability assumes that built-in protections within **Android** and its services could be bypassed or disabled. As of November 4, **Google** has not reported any active exploitation of this flaw, nor is it listed in the **U.S. Cybersecurity and Infrastructure Security Agency**'s (**CISA**) Known Exploited Vulnerabilities catalog. ### Checking Your Android Security Patch Level To ascertain if your device is protected, users should check their **Android** security update level. Devices with a security patch level of 2026-11-01 or later address **CVE-2026-58868** and other vulnerabilities in the Framework, System, and **Android** runtime components. A patch level of 2026-11-05 or later covers all flaws in the November bulletin, including those in the kernel and components from vendors like **Arm**, **Imagination Technologies**, **MediaTek**, **Unisoc**, and **Qualcomm**. **Google** provides the following steps to check your phone's security update status: 1. Open the Settings app. 2. Tap About phone (or About tablet), then Android version. 3. Locate the dates for the Android security update and the Google Play system update. Some fixes for **Android** 10 and newer may also be delivered via **Google Play** system updates. However, **CVE-2026-58868** is not part of these updates, making the **Android** security update date the critical indicator for this specific vulnerability. There is currently no known workaround for devices that cannot yet install the update. ### Remote Denial-of-Service via SMS Another critical flaw, **CVE-2026-58882**, has been identified, allowing for a remote denial-of-service attack without user interaction. This vulnerability resides in the `decodeWapPdu` function, which handles **WAP Push** messages delivered via **SMS**. Security researcher **Mark B** recently published a write-up titled "SMS of Death" detailing a bug in the same function. While **Google**'s bulletin and the **CVE** record do not explicitly link **CVE-2026-58882** to **Mark B**'s findings, the described impact is severe. A single malformed **WAP Push** message can crash `com.android.phone`, terminating active calls, including emergency ones. The message never appears in the inbox, and the phone may repeatedly crash on startup until the malicious message is removed. A public proof-of-concept for this attack exists, and devices running **Android** 12 and 13 are reportedly vulnerable without receiving the fix available for newer versions. ### Other Critical Vulnerabilities **Google**'s November bulletin lists a total of 216 vulnerabilities, with 23 rated as Critical. Among these are two other Critical remote code execution flaws: **CVE-2026-58876** and **CVE-2026-58936**, both located in **Android**'s System component. Six Critical kernel flaws were also addressed, including two in **Bluetooth** code, with the most severe allowing an unauthenticated remote attacker to gain elevated privileges. Additionally, Critical flaws in **MediaTek** modem code and a closed-source **Qualcomm** component were patched. **MediaTek**, in its November bulletin, confirmed its Critical modem flaws are out-of-bounds writes and stated no awareness of active exploitation.