Major tech giants, including Google, Microsoft, Mozilla, Brave, and Apple, have recently rolled out crucial security patches. These patches address a critical security flaw linked to the WebP image codec. This vulnerability, as reported by Stack Diary, could permit attackers to gain access, run malicious code, and even gain total control over affected devices.

The Vulnerability Explained

The root of this severe issue is a vulnerability in the WebP image codec, resulting from a “heap buffer overflow.” In simple terms, it gives malicious entities the power to overwrite data on a targeted computer system. Attackers exploit this flaw by crafting and distributing a corrupted WebP image. When a user views this image, the attacker can potentially scrape data, install malware, or even gain full control over the system.

Affected Platforms

  • Web Browsers: Chrome, Firefox, Edge, Brave, Safari, and Tor
  • Electron-based applications: Signal, 1Password, and Honeyview
  • Other apps that utilize the lbwebp library: Affinity, Gimp, Inkscape, LibreOffice, Telegram, Thunderbird, FFmpeg, and several Android and Flutter-built apps.

Software Version Numbers with Fixes

  • Google Chrome: 116.0.5846.187 (Mac / Linux); 116.0.5845.187/.188 (Windows)
  • Mozilla: Firefox 117.0.1; Firefox ESR 102.15.1; Firefox ESR 115.2.1; Thunderbird 102.15.1; Thunderbird 115.2.2
  • Microsoft Edge: 116.0.1938.81
  • Brave Browser: 1.57.64
  • Apple: Issued a security patch for what appears to be the same issue, referencing a different NIST issue number.

Origin of Discovery

This alarming flaw, indexed as CVE-2023-4863, was initially identified by researchers at The Citizen Lab, affiliated with the University of Toronto. After detecting this vulnerability, the institution promptly alerted both Google and Apple. Following this, Mozilla and Microsoft joined the ranks to address the issue with their respective patches.

Additional Insights

The Citizen Lab also revealed that this particular vulnerability is exploited by NSO Group, a notorious commercial spyware entity, to install its Pegasus spyware on iPhones. The vulnerability was actively utilized as a segment of a zero-click iMessage exploit chain, named BLASTPASS, targeting iPhones operating on iOS (16.6).

Danger Level of the Flaw

Chris Hauk, a consumer privacy advocate at Pixel Privacy, provides insight, stating, “The repercussions of CVE-2023-4863 could be extensive. As several browsers like Edge, Brave, Opera, and Vivaldi are constructed on the Chromium platform, users of these browsers could potentially be affected.”

Buffer overflow vulnerabilities, like CVE-2023-4863, pose a high risk, as Brad Freedman, director of technology at security firm SenseOn, elaborates, “Such vulnerabilities can empower attackers to run malevolent code on computers simply by luring them to a compromised website they oversee.”

Immediate Actions to Take

To safeguard against this vulnerability, users must:

  • Ensure all browsers and applications are updated promptly.
  • Keep an eye out for software updates for all apps and install them immediately.
  • For Chrome users: Click the three dots in the top right corner, select Help > About Google Chrome, let Chrome search for the update, and once it’s available, click “Relaunch” to apply it. Patching swiftly is paramount as Brad Freedman warns, “Malicious entities will intensify their efforts in the upcoming days and weeks to exploit this flaw with heightened reliability, signifying remote code execution will become more probable.”

Best Practices in Digital Security

As vulnerabilities and threats continue to evolve, it’s crucial to adopt best practices to stay ahead of potential breaches. Here are some general recommendations:

  • Regular Monitoring and Audits: Ensure regular system checks and vulnerability assessments to identify potential security loopholes.
  • Employee Training: Regularly educate employees about the importance of security, the latest threats, and how to recognize potential security risks.
  • Use of Multi-Factor Authentication: Enhance account security by activating multi-factor authentication, adding an extra layer of protection beyond just passwords.
  • Backup Regularly: Always maintain up-to-date backups of all essential data. In the event of a breach or system failure, having recent backups can prevent data loss.
  • Stay Informed: Regularly follow cybersecurity news and updates. Being informed about the latest threats and vulnerabilities can provide an edge in prevention and mitigation.


This widespread vulnerability in commonly used software amplifies the potential attack surface for many entities. As these vulnerabilities allow cyber-attackers to remotely execute commands on target computers, organizations might be at risk of data breaches or even ransom threats. Timely updates and vigilance are the need of the hour to prevent such threats to ensure the digital security and integrity of both individual users and organizations.

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