Medium

WebKit process crash on maliciously crafted web content

IdentifiersCVE-2026-20644CWE-787· Out-of-bounds Write

CVE-2026-20644 is a WebKit memory-handling vulnerability affecting Apple platforms and downstream WebKit consumers. Apple states that the issue was addressed with improved memory handling, and that processing maliciously crafted web content may lead to an unexpected process crash. The issue is referenced as WebKit Bugzilla 303444 and is credited to HanQing from TSDubhe and Nan Wang (@eternalsakura13). 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, iPadOS 18.7.5, iOS 26.3, iPadOS 26.3, macOS Tahoe 26.3, and visionOS 26.3. Based on the vendor description, this is a memory-safety flaw in WebKit reachable through web content rendering; however, the specific vulnerable function or code path is not provided in the available content.

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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 causes the targeted WebKit process to crash while rendering attacker-controlled web content. The documented impact is denial of service at the browser or WebKit process level, which may terminate the affected tab, web content process, or application using WebKit. The provided sources do not state that code execution, sandbox escape, or information disclosure is achievable via this CVE.

Mitigation

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

If immediate patching is not possible, reduce exposure to untrusted web content. Practical mitigations include restricting browsing to trusted sites, applying URL/domain filtering or secure web gateway controls to block known-malicious content, minimizing use of applications that render untrusted WebKit content, and isolating high-risk browsing activity. These measures only reduce exposure and do not eliminate the underlying vulnerability.

Remediation

Patch, then assume compromise.

Update to a fixed version provided by the vendor. Apple lists fixes in 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. For Linux and embedded downstreams, upgrade WebKitGTK and WPE WebKit to version 2.50.6 or later. Standard remediation is to deploy the vendor-supplied patched builds containing the improved memory-handling fix.

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

AppleVisionosoperating_system

Rocky LinuxRocky Linuxoperating_system

WebkitgtkWebkit2gtk3application

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

ACTIVITY FEED

Recent activity

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

13 SOURCESView more in app

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 activity8