Medium

WebKit process crash on malicious web content

IdentifiersCVE-2026-20635CWE-476

CVE-2026-20635 is a WebKit memory-handling vulnerability affecting Apple platforms and downstream WebKit consumers. Apple states that processing maliciously crafted web content may lead to an unexpected process crash, and that the issue was addressed with improved memory handling. The issue is referenced as WebKit Bugzilla 304661 and was credited to EntryHi. Affected software includes WebKitGTK and WPE WebKit before 2.50.6, and Apple products prior to the fixes shipped in Safari 26.3, iOS 18.7.5 and iPadOS 18.7.5, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, and watchOS 26.3. The available advisory text does not identify the exact vulnerable function or code path beyond indicating a memory-handling flaw in WebKit triggered during web-content processing.

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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 process to terminate unexpectedly while rendering or processing attacker-controlled web content. Based on the provided advisories, the demonstrated impact is denial of service via process crash; no evidence in the supplied content confirms code execution, sandbox escape, or information disclosure for this CVE.

Mitigation

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

If patching cannot be performed immediately, reduce exposure to untrusted web content. Practical mitigations include restricting browsing to trusted sites, using web/content filtering or isolation controls, limiting use of affected WebKit-based applications in high-risk environments, and disabling or minimizing rendering of attacker-supplied web content where operationally feasible. These measures only reduce exposure and do not remediate the underlying flaw.

Remediation

Patch, then assume compromise.

Update affected software to a fixed release. Apple lists fixes in Safari 26.3, iOS 18.7.5 and iPadOS 18.7.5, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, and watchOS 26.3. For Linux/embedded consumers, upgrade WebKitGTK and WPE WebKit to version 2.50.6 or later.

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

AppleSafariapplication

AppleTvosoperating_system

AppleVisionosoperating_system

AppleWatchosoperating_system

Rocky LinuxRocky Linuxoperating_system

WebkitgtkWebkit2gtk3application

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

ACTIVITY FEED

Recent activity

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

15 SOURCESView more in app

handlers diary fullNews

Feb 11, 2026

Apple Patches Everything: February 2026 - SANS ISC

WebKit crash triggered by malicious web content.

apple supportNews

Feb 11, 2026

About the security content of iOS 26.3 and iPadOS 26.3 - Apple Support

Unknown (CVE listed without impact/description in provided content).

What this page doesn’t show

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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 activity9