Unrated

WebKit sandbox escape via restricted web content processing

IdentifiersCVE-2026-43725CWE-20

CVE-2026-43725 is a WebKit vulnerability affecting Safari, iOS, iPadOS, and macOS Tahoe. According to Apple, a malicious website may be able to process restricted web content outside the sandbox. The issue was addressed through improved input validation, indicating the flaw stems from insufficient validation of attacker-controlled web content that could cause WebKit to handle restricted content in a way that bypasses intended sandbox boundaries. Publicly provided details do not identify the specific vulnerable function or code path.

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 may allow a remote attacker operating a malicious website to bypass WebKit/Safari sandbox restrictions for web content processing. This could permit restricted web content to be processed outside the intended sandbox, weakening browser isolation and potentially increasing access to resources or capabilities that should not be available to untrusted web content. The provided sources do not describe confirmed code execution or in-the-wild exploitation.

Mitigation

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

Until patches can be applied, reduce exposure to untrusted web content by limiting browsing to trusted sites, using least-privilege browsing contexts, and restricting use of affected Safari/WebKit-based clients on exposed systems. Standard browser hardening and rapid patch deployment are the primary mitigations. No vendor-specific workaround beyond updating was provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply Apple's fixes by upgrading affected products to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2 or later. Apple states the issue was resolved with improved input validation.

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

AppleIosoperating_system

AppleIpadosoperating_system

AppleMacos Tahoeoperating_system

AppleSafariapplication

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

ACTIVITY FEED

Recent activity

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

7 SOURCESView more in app

the hacker newsNews

Jun 30, 2026

Apple Patches 30+ iOS, macOS, Safari Flaws, Including AI-Discovered WebKit Bugs

A WebKit vulnerability that could allow a malicious website to process restricted web content outside the sandbox.

handlers diary fullNews

Jun 30, 2026

June 2026 Apple Updates - SANS Internet Storm Center

A WebKit sandbox escape vulnerability that may allow a malicious website to process restricted web content outside the sandbox.

apple supportNews

Jun 29, 2026

About the security content of iOS 26.5.2 and iPadOS 26.5.2 - Apple Support

A sandbox bypass vulnerability that could allow a malicious website to process restricted web content outside the sandbox.

apple supportNews

Jun 29, 2026

About the security content of macOS Tahoe 26.5.2 - Apple Support

A macOS Tahoe vulnerability that may allow a malicious website to process restricted web content outside the sandbox.

+1 more in the timeline

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 activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-43725

NVD

nvd.nist.gov/vuln/detail/CVE-2026-43725

MITRE CWE · CWE-20

cwe.mitre.org