The vulnerability CVE-2026-0822 affects the quickjs-ng quickjs JavaScript engine, specifically versions up to 0.11.0. The issue resides in the js_typed_array_sort function within quickjs.c, where improper handling of typed array sorting operations leads to a heap-based buffer overflow. This memory corruption flaw can be triggered remotely without requiring authentication, although user interaction is necessary to initiate the attack vector. The overflow can potentially allow attackers to execute arbitrary code or cause denial of service by crashing the application. The vulnerability has a CVSS 4.0 score of 5.3, reflecting medium severity due to its remote exploitability and lack of required privileges, but limited impact on confidentiality and integrity. The patch identified by commit 53eefbcd695165a3bd8c584813b472cb4a69fbf5 fixes the issue by correcting the buffer management in the sorting function. Public exploit code exists, increasing the risk of exploitation, although no active widespread attacks have been documented. Quickjs is often embedded in IoT devices, edge computing platforms, and lightweight web applications, making this vulnerability relevant for environments where quickjs is used as a scripting engine. The flaw's exploitation could lead to compromised device integrity or service disruption.

For European organizations, the impact of CVE-2026-0822 depends largely on the extent of quickjs usage within their software stacks. Industries relying on embedded systems, IoT devices, or custom web applications that embed quickjs for scripting are at risk. Successful exploitation could lead to arbitrary code execution, enabling attackers to take control of affected devices or applications, potentially leading to data breaches, service outages, or lateral movement within networks. The medium severity score suggests moderate risk; however, the availability of public exploits raises the likelihood of targeted attacks. Critical infrastructure sectors such as manufacturing, telecommunications, and smart city deployments in Europe could face operational disruptions if vulnerable devices are compromised. Additionally, organizations with supply chains involving quickjs-based components may experience indirect exposure. The vulnerability's remote exploitability without authentication increases the attack surface, especially for externally facing services or devices.

To mitigate CVE-2026-0822, European organizations should immediately apply the official patch identified by commit 53eefbcd695165a3bd8c584813b472cb4a69fbf5 to all affected quickjs versions up to 0.11.0. Conduct a thorough inventory to identify all instances of quickjs usage within internal and third-party software, including embedded devices and IoT platforms. Where patching is not immediately feasible, implement network-level controls to restrict access to vulnerable services and employ application-layer firewalls to detect and block suspicious input patterns targeting typed array sorting. Employ runtime memory protection mechanisms such as Address Space Layout Randomization (ASLR) and heap integrity checks to reduce exploitation success. Regularly monitor security advisories for updates or new exploit techniques related to quickjs. Additionally, perform code reviews and fuzz testing on custom integrations of quickjs to identify similar memory handling issues. Educate developers and system administrators about the risks of heap-based buffer overflows and the importance of timely patching.