WebKit denial-of-service in Apple Safari, iOS, iPadOS, macOS, visionOS, WebKitGTK, and WPE WebKit
CVE-2026-20652 is a WebKit memory-handling vulnerability. Apple states the issue was addressed with improved memory handling, and multiple advisories describe the impact as a remote attacker being able to cause a denial-of-service. Related Apple and downstream WebKitGTK/WPE WebKit advisories indicate that the flaw can be triggered remotely, including via maliciously crafted web content, resulting in an unexpected process crash or denial-of-service condition. The issue is referenced in WebKit Bugzilla as 303959 and was credited to Nathaniel Oh (@calysteon). Affected products include WebKitGTK and WPE WebKit before 2.50.6, and Apple platforms prior to the fixed releases Safari 26.3, iOS 18.7.5, iPadOS 18.7.5, iOS 26.3, iPadOS 26.3, macOS Tahoe 26.3, and visionOS 26.3.
Are you exposed to this one?
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Remote denial-of-service in WebKit.
Web content processing crash (DoS) due to state management issue; fixed with improved state management.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.