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CISA Warns of Apple WebKit Vulnerability 0-Day Vulnerability Exploited in Attacks

CISA has issued an urgent notification regarding a critical zero-day vulnerability in Apple WebKit that is actively being exploited in attacks. The vulnerability, designated as CVE-2025-43529 , has been added to CISA's catalog of vulnerabilities…

BBy Ben EmersonDec 16, 20252 min read

CISA has issued an urgent notification regarding a critical zero-day vulnerability in Apple WebKit that is actively being exploited in attacks. The vulnerability, designated as CVE-2025-43529 , has been added to CISA's catalog of vulnerabilities requiring immediate attention, with a strict deadline set for organizations to implement protective measures.

The vulnerability involves a use-after-free flaw in WebKit, affecting multiple Apple products such as iOS, iPadOS, macOS, and other platforms utilizing WebKit for HTML processing. This issue resides in the memory management layer of the WebKit rendering engine.

Field Information

CVE ID CVE-2025-43529

Vulnerability Type Use-After-Free (CWE-416)

Affected Products Apple iOS, iPadOS, macOS, Safari, WebKit-based applications

CISA has issued an urgent notification regarding a critical zero-day vulnerability in Apple WebKit that is actively being exploited in attacks.
Ben Emerson · Thehackingpost

Vulnerability Description Use-after-free in WebKit HTML parser allowing memory corruption through maliciously crafted web content

Exploitation Status Actively exploited in the wild

The vulnerability enables attackers to manipulate memory corruption via carefully crafted malicious web content. When users access these specially designed websites, the vulnerability can be triggered without additional user interaction, increasing its threat level.

The widespread nature of this vulnerability is concerning as it impacts not only Apple's native Safari browser but also third-party applications that use WebKit as their HTML rendering engine . This expands the potential attack surface across the ecosystem.

The vulnerability is classified as a use-after-free condition under CWE-416, indicating that attackers could potentially execute arbitrary code on vulnerable systems.

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CISA emphasizes that organizations and users should apply security updates from Apple immediately upon availability. The agency has mandated a compliance deadline of January 5, 2026, for federal agencies and contractors under the Binding Operational Directive (BOD) 22-01 framework.

In cloud service environments, organizations are advised to follow their service providers' guidance and implement compensating controls where necessary. Users should enable automatic security updates on all Apple devices to ensure timely patch installation.

Organizations should inventory all systems using WebKit-based browsers and applications and prioritize patching accordingly. For systems where immediate patching is not possible, administrators should restrict web browsing to trusted sites and implement network-based filtering of malicious content.

Security researchers continue to investigate the scope and implications of this vulnerability. Apple will release additional details regarding patched versions and remediation guidance through official security advisories. Organizations should monitor CISA alerts and Apple's security updates page regularly for the latest information.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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