High

WebKit memory corruption in Apple Safari and Apple platforms

IdentifiersCVE-2025-43431CWE-119· Improper Restriction of Operations…

CVE-2025-43431 is a WebKit memory-handling vulnerability affecting Safari and multiple Apple operating systems, as well as WebKitGTK and WPE WebKit. Apple states that processing maliciously crafted web content may lead to memory corruption, and that the issue was addressed with improved memory handling. Reported fixed versions include 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; watchOS 26.1. WebKitGTK and WPE WebKit are affected before 2.50.2. The flaw was credited to Google Big Sleep. The specific vulnerable function is not identified in the provided 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 can corrupt memory in the WebKit content-processing context when a target processes attacker-controlled web content. The documented impact is memory corruption; depending on exploitability, this may manifest as a process crash or potentially enable more serious compromise of the affected browser or application rendering the malicious content. The provided sources do not confirm in-the-wild exploitation or a specific post-corruption outcome such as arbitrary code execution 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 and limit use of applications embedding vulnerable WebKit components. For WebKitGTK-based environments, the provided advisory suggests restricting access to untrusted web content, considering temporary disabling of webkit2gtk-based browsers or applications, and using network segmentation to reduce exposure. No product-specific workaround beyond updating is provided in the source material.

Remediation

Patch, then assume compromise.

Apply vendor fixes by updating affected products to patched releases. The provided content identifies fixes 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; watchOS 26.1. For WebKitGTK and WPE WebKit, upgrade to version 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

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

10 SOURCESView more in app

zdnet zero dayNews

Jan 24, 2026

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

Use-after-free in web content processing leading to unexpected process crash.

apple supportNews

Dec 12, 2025

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

A memory corruption vulnerability in web content processing affecting macOS Sonoma and macOS Sequoia.

cvefeed high severityNews

Nov 4, 2025

CVE-2025-43431 - Safari Memory Corruption Vulnerability

A high-severity memory corruption vulnerability in Apple Safari and related Apple operating systems that can be triggered by processing maliciously crafted web content, potentially leading to remote code execution or compromise.

bugflationNews

Nov 3, 2025

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

A WebKit memory-handling vulnerability in Safari 26.1 that could lead to memory corruption.

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