USN-6784-1: Critical cJSON Vulnerabilities Exposed

In recent cybersecurity developments, a significant vulnerability has been identified in cJSON, a popular lightweight JSON parser in C. This vulnerability impacts systems running Ubuntu 22.04 LTS and Ubuntu 23.10. The concerns raised by security bulletins, specifically USN-6784-1, highlight severe implications that could allow attackers to exploit this flaw, causing potential denial of service scenarios.

The issue stems from how cJSON manages certain types of input. Specifically, the vulnerabilities identified are CVE-2023-50471 and CVE-2023-50472 proposed for this year, along with an additional future potential weakness identified as CVE-2024-31755 by cybersecurity researcher Luo Jin. These vulnerabilities all relate to cJSON's handling of input that, when processed incorrectly, lead to application crashes due to segmentation violations in different functions of the cJSON library.

CVE-2023-50471 points out a segmentation violation within the function cJSON_InsertItemInArray located at cJSON.c. This flaw allows an attacker to introduce data that cJSON fails to process correctly, resulting in a crash.

CVE-2023-50472 involves a similar segmentation fault but occurs within the function cJSON_SetValuestring at cJSON.c, leading to similar denial of service outcomes. Additionally, the prospective CVE-2024-31755 underscores the ongoing vulnerabilities within cJSON that could further compromise system stability and security in the future.

These critical vulnerabilities require immediate attention from developers and system administrators. cJSON is widely used in various applications for parsing JSON data due to its minimalistic design and efficiency, making it a critical component in many software ecosystems. As such, the impact of these vulnerabilities is extensive, affecting numerous applications and services running on the affected Ubuntu versions.

To address these issues, it's crucial for affected parties to update their systems as recommended by Ubuntu's security advisories. System updates and specific patches will be pivotal in mitigating the risks associated with these vulnerabilities.

To learn more about how you can safeguard your systems and for further details on obtaining and applying the necessary security patches, please visit

Taking proactive steps by staying updated with the latest security advisories and ensuring your systems are patched can significantly diminish the risks posed by such vulnerabilities. Cybersecurity is a continually evolving field, and staying informed is the best defense against potential threats.