High

Use-after-free in WebKit web content processing

IdentifiersCVE-2026-28883CWE-416· Use After Free

CVE-2026-28883 is a WebKit use-after-free vulnerability in Apple platforms. Apple states that processing maliciously crafted web content may lead to an unexpected process crash. The issue was addressed with improved memory management and is fixed in Safari 26.5, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5. The available context identifies the bug class as use-after-free and associates it with WebKit handling of attacker-controlled web content.

For your environment

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ANALYST BRIEF

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.

Successful exploitation can cause the targeted WebKit-related process, or Safari in affected contexts, to crash unexpectedly, resulting in denial of service for the browsing session or affected application component. Based on the provided content, there is no specific evidence that Apple confirmed code execution, sandbox escape, or data disclosure for this CVE; the documented impact is process crash.

Mitigation

If you can’t patch tonight, do this now.

Until patches are applied, reduce exposure to untrusted web content by limiting browsing to trusted sites, restricting use of embedded WebKit views where operationally feasible, and applying standard browser hardening controls. Because the trigger is maliciously crafted web content, minimizing attacker-controlled web rendering is the primary temporary mitigation. No vendor-specific workaround beyond updating is provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade affected systems to versions containing Apple's fix: Safari 26.5, iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5, and corresponding supported Apple security updates where this WebKit fix is included. Apple states the issue was remediated through improved memory management in WebKit.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

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.

VendorProductType

AppleIpadosoperating_system

AppleIphone Osoperating_system

AppleMacosoperating_system

AppleTvosoperating_system

AppleVisionosoperating_system

AppleWatchosoperating_system

WebkitgtkWebkit2gtk3application

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

20 SOURCESView more in app

apple supportNews

May 13, 2026

About the security content of Safari 26.5 - Apple Support

A data protection issue in Apple software that may allow an app to access sensitive user data.

apple supportNews

May 13, 2026

About the security content of Safari 26.5 - Apple Support

A data protection issue in Apple software for macOS Sonoma and macOS Sequoia where an app may be able to access sensitive user data.

handlers diary fullNews

May 11, 2026

Apple Patches Everything - SANS Internet Storm Center

A WebKit vulnerability where maliciously crafted web content may cause an unexpected process crash.

apple supportNews

May 11, 2026

About the security content of macOS Tahoe 26.5 - Apple Support (CA)

A macOS Tahoe vulnerability that may allow an app to access sensitive user data.

+8 more in the timeline

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity6