Medium

Use-after-free in WebKit processing malicious web content

IdentifiersCVE-2025-43536CWE-416· Use After Free

CVE-2025-43536 is a use-after-free vulnerability in WebKit, including Safari, WebKitGTK, and WPE WebKit. The issue was attributed to improper memory lifetime handling and was addressed through improved memory management. According to the provided advisory content, the flaw can be triggered when the affected engine processes maliciously crafted web content, resulting in an unexpected process crash. Affected products mentioned in the supplied content include WebKitGTK and WPE WebKit before 2.50.4, as well as Apple platforms fixed in Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, and macOS Tahoe 26.2.

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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 via an unexpected crash of the targeted WebKit process while rendering or otherwise processing attacker-controlled web content. Based on the specific information provided here, the documented impact is process crash; no verified arbitrary code execution claim is provided for this CVE in the supplied content.

Mitigation

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

If patching cannot be performed immediately, reduce exposure to untrusted web content in applications embedding WebKit. The supplied advisory suggests restricting access to untrusted web content, considering disabling JavaScript in WebKitGTK-based browsers, and using alternative browsers where feasible until updates are applied.

Remediation

Patch, then assume compromise.

Apply the vendor fixes referenced in the supplied content. For Apple platforms, update to Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, and macOS Tahoe 26.2 or later, as applicable. For WebKitGTK and WPE WebKit, upgrade to version 2.50.4 or later. Debian guidance in the provided content recommends upgrading webkit2gtk to 2.50.4-1~deb12u1 for bookworm or 2.50.4-1~deb13u1 for trixie, as appropriate.

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

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

ACTIVITY FEED

Recent activity

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

8 SOURCESView more in app

sophos threat researchNews

Jan 1, 2026

July Patch Tuesday offers 127 fixes | SOPHOS

A critical Adobe Reader vulnerability caused by incorrect authorization.

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 activity6