Medium

WebKit buffer overflow in malicious web content handling

IdentifiersCVE-2025-43429CWE-120

CVE-2025-43429 is a buffer overflow vulnerability in WebKit. Apple states the issue was addressed with improved bounds checking. The flaw can be triggered when WebKit processes maliciously crafted web content, leading to an unexpected process crash. The issue is documented as affecting Apple platforms including Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, and watchOS 26.1. Supporting content also indicates WebKitGTK and WPE WebKit are affected before version 2.50.2.

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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 denial of service through an unexpected crash of the affected WebKit-rendering process while handling attacker-controlled web content. The provided content does not confirm code execution or sandbox escape for this CVE specifically; the verified impact is process termination/crash.

Mitigation

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

If patching cannot be performed immediately, reduce exposure to untrusted web content, especially in applications embedding WebKit. For WebKitGTK deployments, consider temporarily disabling or restricting webkit2gtk-based browsers/applications where feasible. Network and application isolation can reduce exposure, but no complete mitigation short of updating is provided in the source material.

Remediation

Patch, then assume compromise.

Apply the vendor fixes. Apple indicates the issue is fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, and watchOS 26.1. For downstream WebKit consumers, update WebKitGTK and WPE WebKit to 2.50.2 or later. Debian guidance in the provided content recommends upgrading webkit2gtk to 2.50.2-1~deb12u1 on bookworm or 2.50.2-1~deb13u1 on trixie, as applicable.

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

AppleSafariapplication

AppleTvosoperating_system

AppleVisionosoperating_system

AppleWatchosoperating_system

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

ACTIVITY FEED

Recent activity

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

9 SOURCESView more in app

zdnet zero dayNews

Jan 24, 2026

About the security content of iOS 26.1 and iPadOS 26.1 - Apple Support

Multiple web content processing issues mitigated by disabling array allocation sinking; leads to unexpected process crash.

apple supportNews

Dec 12, 2025

About the security content of Safari 26.1 - Apple Support (MT)

A buffer overflow vulnerability in web content processing that may cause an unexpected process crash on macOS Sonoma and macOS Sequoia.

bugflationNews

Nov 3, 2025

Apple WebKit 26.1 security cluster credited to Google Big Sleep - Bugflation

A WebKit buffer overflow vulnerability in Safari 26.1 addressed with improved bounds checking.

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 activity5