Unrated

Out-of-bounds write in WebKit leading to Safari crash

IdentifiersCVE-2026-43745CWE-787

CVE-2026-43745 is an out-of-bounds write vulnerability in Apple WebKit, affecting Safari and Apple platforms that use the engine. Apple states that the issue was addressed with improved input validation. When Safari/WebKit processes maliciously crafted web content, improper bounds enforcement can result in a write outside the intended memory region, leading to instability and an unexpected Safari crash. The issue is fixed in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.

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 can cause Safari to crash while rendering or processing attacker-controlled web content. Based on the provided information, the demonstrated impact is denial of service via browser crash. Although out-of-bounds writes are memory-safety flaws that can sometimes be developed into more serious exploitation, the supplied content only confirms unexpected Safari crash behavior and does not provide evidence of code execution or active exploitation.

Mitigation

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

Until patches are fully deployed, reduce exposure by limiting use of untrusted websites and web content in Safari and other applications embedding WebKit. Enterprise defenders can prioritize rapid browser and OS patch deployment, restrict browsing to trusted destinations where feasible, and use compensating controls such as web filtering and content isolation. No vendor-specific workaround beyond updating is provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply Apple's fixes by upgrading to Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, as applicable. Ensure all affected Apple devices and Safari installations are updated to the vendor-patched versions that include the improved input validation for this WebKit issue.

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

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

8 SOURCESView more in app

security affairsNews

Jun 30, 2026

Apple Fixes WebKit Flaws in iOS and macOS, With Help From AI Tools - Security Affairs

An out-of-bounds write vulnerability in WebKit that can cause Safari to crash when a user visits specially crafted web content.

the hacker newsNews

Jun 30, 2026

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

A WebKit out-of-bounds write vulnerability that can cause an unexpected Safari crash when processing maliciously crafted web content.

handlers diary fullNews

Jun 30, 2026

June 2026 Apple Updates - SANS Internet Storm Center

A WebKit vulnerability where malicious web content may cause Safari to crash unexpectedly.

apple supportNews

Jun 29, 2026

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

An out-of-bounds write vulnerability in web content processing that could cause an unexpected Safari crash.

+2 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-2026-43745

NVD

nvd.nist.gov/vuln/detail/CVE-2026-43745

MITRE CWE · CWE-787

cwe.mitre.org