Medium

Buffer Overflow in WebKit (CVE-2025-43501)

IdentifiersCVE-2025-43501CWE-120· Buffer Copy without Checking Size…

CVE-2025-43501 is a buffer overflow vulnerability in WebKit, reported by Hossein Lotfi of Trend Micro Zero Day Initiative. The flaw arises from improper memory handling when processing maliciously crafted web content. The vulnerability affects multiple Apple platforms, including Safari, iOS, iPadOS, macOS, and visionOS, and is addressed in Safari 26.2, iOS/iPadOS 18.7.3 and 26.2, macOS Tahoe 26.2, and visionOS 26.2. Exploitation may result in an unexpected process crash and potentially arbitrary code execution, depending on the context and exploit technique.

For your environment

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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 process crashes (denial of service) and, depending on the attacker's capabilities and the context, could potentially allow arbitrary code execution within the context of the affected process. This could result in compromise of user data or further exploitation of the system.

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 to reduce exposure.

Remediation

Patch, then assume compromise.

Update to Safari 26.2, iOS/iPadOS 18.7.3 or 26.2, macOS Tahoe 26.2, and visionOS 26.2, or the latest stable versions of WebKitGTK and WPE WebKit (2.50.4 or later). Distributions such as Debian have released patched packages (e.g., webkit2gtk 2.50.4-1~deb12u1).

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

AppleVisionosoperating_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