Apple Issues Emergency Patch After Critical Chrome-Based Exploit Hits Safari

A Race Against Exploits: Apple Reacts to Google Chrome-Based Zero-Day Threat

In a rapidly escalating cybersecurity event, Apple has released urgent security updates targeting a high-severity vulnerability tracked as CVE-2025-6558, which has been actively exploited in the wild. This flaw, assigned a CVSS severity score of 8.8, has already been weaponized in zero-day attacks—specifically targeting users of Google Chrome, and now affecting Apple’s Safari due to shared code dependencies.

The vulnerability stems from insufficient validation of untrusted input in ANGLE (Almost Native Graphics Layer Engine) and GPU handling in Google Chrome versions prior to 138.0.7204.157. ANGLE, developed by Google, is a critical component used across major browsers as a graphics translation layer that bridges OpenGL ES with other APIs like Direct3D, Metal, and Vulkan. Its widespread use means any flaw within ANGLE’s implementation could ripple across multiple platforms.

Researchers Clément Lecigne and Vlad Stolyarov from Google’s Threat Analysis Group (TAG) discovered the exploit on June 23, 2025. TAG’s primary focus is tracking and mitigating threats from nation-state actors and commercial surveillance vendors. The presence of this vulnerability in wild exploits strongly suggests state-backed threat actors are leveraging it.

Following its discovery, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) officially added the flaw to its Known Exploited Vulnerabilities (KEV) catalog, signaling the urgent need for mitigation by both private and public entities. Google acknowledged the live exploitation of the vulnerability and swiftly released patches for Chrome. Shortly after, Apple followed with emergency WebKit updates, confirming that Safari—relying on open-source ANGLE—was also at risk.

According to

What Undercode Say:

This incident underscores the precarious interdependence of modern browsers on open-source modules—a reality that’s both a strength and a vulnerability. When one foundational engine like ANGLE becomes compromised, the cascading effects can stretch across Chrome, Safari, Edge, and others, putting millions of users at risk in real-time.

What’s particularly alarming here is the weaponization of the bug before it was publicly disclosed. This marks it as a true zero-day, meaning attackers had a head start. Given the involvement of Google’s Threat Analysis Group, we’re likely dealing with nation-state-level espionage or surveillance operations. TAG’s past investigations have linked similar attacks to APT groups from China, North Korea, and Russia—though no attribution has been officially made yet.

Apple’s quick release of patches is commendable, but it also reveals the complexity of securing a closed ecosystem like iOS or macOS when its components depend on open projects like ANGLE. The timing suggests Apple may have been caught off-guard, scrambling to patch a vulnerability born outside its development environment.

Furthermore, the communication strategy leaves something to be desired. Apple’s advisory feels muted compared to Google’s direct alert that the exploit “exists in the wild.” A more aggressive, transparent disclosure from Apple could help users understand the urgency—especially when malicious web content can trigger Safari crashes or worse.

Another dimension of this story is the lack of granularity on how many users were affected. Apple and Google haven’t released detailed statistics or geographic data. But given Chrome’s 3.2 billion users and Safari’s dominance on Apple devices, hundreds of millions were likely vulnerable at some point.

The deeper concern? This may be just one of many similar flaws lurking in shared browser architecture. As open-source codebases continue to grow in complexity, threat actors will likely keep probing for edge-case failures like this. The industry’s best defense remains constant, collaborative security auditing and rapid-response patch cycles, as demonstrated here.

🔍 Fact Checker Results:

✅ Confirmed Exploit in the Wild: Verified by Google TAG and added to CISA’s KEV list.
✅ ANGLE as Source of Vulnerability: Shared component across Chrome and Safari.
✅ CVE-2025-6558 Score Validated: CVSS score of 8.8 confirmed by NVD.

📊 Prediction: Future Threats Will Target Shared Open-Source Engines

Given the ongoing reliance on open-source infrastructure like ANGLE, WebKit, and Chromium, attackers will continue to focus their efforts here. We predict a sharp rise in cross-browser zero-days over the next 12 months, especially those that pivot between ecosystems—starting in Chrome and bleeding into Safari, Edge, or even niche browsers. Developers must prioritize sandbox isolation, better input validation, and dedicated security auditing of shared modules to prevent future exploits.

Security response windows are closing. Expect vendors like Apple and Google to shorten patch deployment cycles and increase bug bounty incentives to get ahead of the next breach.