Critical WebP Vulnerability (CVE-2023-4863) Impacts Major Browsers and Applications


A significant security vulnerability, identified as CVE-2023-4863, has emerged, posing a substantial risk of remote system access by malicious actors. This vulnerability affects not only major web browsers but also numerous applications reliant on the WebP Codec for rendering images. This article provides essential insights into the CVE-2023-4863 vulnerability, its implications, and recommended actions.


Understanding the WebP CVE-2023-4863 Vulnerability:

CVE-2023-4863 is the assigned identifier for the vulnerability in the WebP Codec. The root cause of this vulnerability resides within a specific function of the WebP rendering code known as “BuildHuffmanTable,” rendering the codec susceptible to heap buffer overflows.


A heap buffer overflow transpires when a program exceeds the designated memory buffer capacity, potentially overwriting adjacent memory areas and compromising data integrity. This security flaw enables cybercriminals to exploit heap buffer overflows to gain remote control over systems and devices.


The perpetrators can target applications known to possess buffer overflow vulnerabilities by transmitting malicious data. For instance, they may upload a malicious WebP image capable of deploying code onto a user’s device when viewed through a web browser or another application.


The widespread use of the WebP Codec across various platforms and applications intensifies the seriousness of the CVE-2023-4863 vulnerability. Apart from major browsers, countless applications rely on this codec for rendering WebP images, making the extent of the vulnerability’s impact challenging to ascertain and resolve effectively.


Securing Your Web Browsing Experience:

Most major web browsers have proactively addressed the CVE-2023-4863 vulnerability through security updates. Therefore, ensuring your web browsers are updated to their latest versions will enable you to browse the internet securely. Prominent browser developers such as Google, Mozilla, Microsoft, Brave, and Tor have already released security patches to mitigate this threat.


Specific versions containing fixes for CVE-2023-4863 are as follows:


– Chrome: Version 116.0.5846.187 (Mac / Linux); version 116.0.5845.187/.188 (Windows)

– Firefox: Firefox 117.0.1; Firefox ESR 115.2.1; Thunderbird 115.2.2

– Edge: Edge version 116.0.1938.81

– Brave: Brave version 1.57.64

– Tor: Tor Browser 12.5.4


If you are using an alternative browser, check for updates and seek specific references to the CVE-2023-4863 heap buffer overflow vulnerability in WebP. If such references are absent, consider switching to one of the browsers listed above until your preferred browser is patched.


Navigating the Security of Your Applications:

Addressing the CVE-2023-4863 vulnerability within applications presents a more intricate challenge. Unfortunately, this vulnerability affects an undisclosed number of apps. Any software utilizing the libwebp library is susceptible, necessitating individual software providers to release their security patches.


Furthermore, the vulnerability is embedded within various popular frameworks used for app development. In such cases, the frameworks must be updated initially, followed by software providers adopting the latest versions to safeguard their users. This complexity complicates the task of identifying affected applications and those that have remedied the issue.


Notable apps affected by this vulnerability encompass Microsoft Teams, Slack, Skype, Discord, Telegram, 1Password, Signal, LibreOffice, and the Affinity suite, among others.



To mitigate the CVE-2023-4863 WebP Codec vulnerability, it is imperative to diligently update all relevant components. Start by updating your web browsers and proceed to your most critical applications. Examine the release notes for each app, seeking explicit references to CVE-2023-4863. If unavailable, consider switching to a secure alternative or monitor for security updates released after September 12.


While these measures cannot guarantee comprehensive protection, they serve as the most viable recourse currently available. The CVE-2023-4863 vulnerability underscores the importance of balancing performance and security in technology development, urging both developers and users to prioritize security in an increasingly interconnected digital landscape.