Medium

WebKit process crash on maliciously crafted web content

IdentifiersCVE-2026-28857CWE-119

CVE-2026-28857 is a WebKit memory-handling vulnerability affecting Apple Safari/WebKit and downstream WebKitGTK and WPE WebKit builds. Apple and WebKitGTK describe the issue as being fixed through improved memory handling, and state that processing maliciously crafted web content may lead to an unexpected process crash. The issue affects WebKitGTK and WPE WebKit before 2.52.1 and was fixed in Safari 26.4, iOS 26.4, iPadOS 26.4, macOS Tahoe 26.4, and visionOS 26.4. No vulnerable function or root-cause primitive beyond memory-handling weakness is provided in the supplied 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-based rendering process to crash when a victim processes attacker-controlled web content. Based on the provided information, the demonstrated impact is denial of service/process termination rather than confirmed code execution or sandbox escape.

Mitigation

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

Until patching is possible, reduce exposure to untrusted web content in affected WebKit-based applications and browsers, especially embedded WebKit consumers. Limit or disable access to attacker-controlled sites where operationally feasible, and prefer patched browser/runtime versions. No specific workaround beyond updating is provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply the vendor fixes: update to Safari 26.4, iOS 26.4, iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4, or upgrade WebKitGTK/WPE WebKit to version 2.52.1 or later. The issue was remediated by improved memory handling 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

AppleIosoperating_system

AppleIpadosoperating_system

AppleIphone Osoperating_system

AppleMacosoperating_system

AppleSafariapplication

AppleVisionosoperating_system

Rocky LinuxRocky Linuxoperating_system

WebkitgtkWebkit2gtk3application

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

ACTIVITY FEED

Recent activity

10 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

10 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

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