Use-after-free RCE in Apple Safari WebCore Style Resolver
CVE-2026-28955 is a WebKit/Safari memory-safety vulnerability affecting Apple Safari and related Apple platforms that process web content. Apple describes the issue generically as being addressed with improved memory handling and notes that processing maliciously crafted web content may lead to an unexpected process crash. Supporting content from ZDI provides more specific technical detail: the flaw is a use-after-free in the WebCore style resolver within Web Inspector, caused by failure to validate the existence of an object before operating on it. This can be triggered by malicious web content and, in the Safari context, may be reachable when a target visits a malicious page or opens a malicious file. Apple fixed the issue in Safari 26.5, iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5.
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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
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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
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown
Unknown
A vulnerability in macOS Tahoe acknowledged by Apple, but no technical details are provided in the content excerpt.
A vulnerability in Apple TV software referenced in the advisory, but no technical details are provided in the content excerpt.
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.