Medium

Information disclosure in WebKit due to memory initialization issue

IdentifiersCVE-2025-46299CWE-665

CVE-2025-46299 is a WebKit vulnerability caused by a memory initialization issue. According to the provided advisories, processing maliciously crafted web content may disclose internal states of the application. Apple states the issue was addressed with improved memory handling, and WebKitGTK/WPE WebKit describe affected versions as WebKitGTK and WPE WebKit before 2.52.0. Apple fixed the issue in Safari 26.2, iOS 26.2, iPadOS 26.2, macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, and watchOS 26.2. Based on the available information, this is an information disclosure flaw arising from improper initialization of memory during WebKit processing of attacker-controlled web 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 may allow disclosure of internal application state while rendering or otherwise processing maliciously crafted web content. The provided material does not indicate direct code execution or privilege escalation; the documented impact is limited to information disclosure of app-internal state, which could aid further exploitation, weaken isolation assumptions, or expose sensitive runtime data.

Mitigation

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

If patching cannot be performed immediately, reduce exposure to untrusted or attacker-controlled web content. Practical mitigations include restricting browsing to trusted sites, using web filtering or network controls to limit access to untrusted content, and minimizing use of affected WebKit-based applications on exposed systems until updates are installed. No product-specific workaround beyond limiting exposure is provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply vendor fixes by upgrading to Safari 26.2, iOS 26.2, iPadOS 26.2, macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, and watchOS 26.2, or to WebKitGTK/WPE WebKit 2.52.0 or later. The issue was addressed through improved memory handling.

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

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

7 SOURCESView more in app

bugflationNews

Jan 9, 2026

Apple WebKit 26.2 follow-up issues credited to Google Big Sleep - Bugflation

A WebKit vulnerability in Apple iOS 26.2 and iPadOS 26.2 where processing maliciously crafted web content could disclose internal states of the app.

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 activity2