Low

Race Condition in WebKit (CVE-2025-43531)

IdentifiersCVE-2025-43531CWE-362· Concurrent Execution using Shared…

CVE-2025-43531 is a race condition vulnerability in WebKit, reported by Phil Pizlo of Epic Games. The flaw arises from improper state handling, which could be triggered by processing maliciously crafted web content. The vulnerability affects multiple Apple platforms (watchOS, Safari, iOS, iPadOS, macOS, visionOS, tvOS) and is addressed in versions 26.2 or later. The primary impact is an unexpected process crash, though the underlying race condition could potentially be leveraged for more severe outcomes depending on exploitation context.

For your environment

Are you exposed to this one?

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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 of this vulnerability may lead to a process crash (denial of service) when maliciously crafted web content is processed. While the advisory does not explicitly mention arbitrary code execution for this CVE, race conditions in WebKit have historically been associated with memory corruption and, in some cases, code execution, though no such exploitation is reported here.

Mitigation

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

Until patches can be applied, restrict access to untrusted web content, consider disabling JavaScript in WebKit-based browsers, and use alternative browsers where feasible. Limit exposure by avoiding suspicious or untrusted websites.

Remediation

Patch, then assume compromise.

Update to the latest versions of affected software: watchOS 26.2, Safari 26.2, iOS/iPadOS 18.7.3 or 26.2, macOS Tahoe 26.2, visionOS 26.2, and tvOS 26.2. For Linux distributions, update WebKitGTK and WPE WebKit to version 2.50.4 or later as provided by your vendor.

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

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

ACTIVITY FEED

Recent activity

9 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.

9 SOURCESView more in app

No news coverage yet. Advisories and community discussion only.

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 activity8