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Use-after-free in Apple Safari/WebKit web content processing

IdentifiersCVE-2026-43734CWE-416

CVE-2026-43734 is a use-after-free vulnerability in Apple’s web content processing stack affecting Safari, iOS, iPadOS, and macOS Tahoe. According to the provided advisory text, the flaw is triggered when the target processes maliciously crafted web content. Apple states the issue was addressed through improved memory management. The available information does not identify the specific vulnerable function or component beyond web content processing.

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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 triggering of the flaw may cause an unexpected process crash while processing attacker-controlled web content. Based on the provided information, the documented impact is denial of service at the affected process level; no confirmed code-execution or data-disclosure impact is stated in the supplied content for this CVE.

Mitigation

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

Until patches can be applied, reduce exposure to untrusted web content and limit browsing to trusted sites where feasible. Because exploitation requires processing maliciously crafted web content, temporary risk reduction can include restricting use of the affected browser/webview components for high-risk activity. No vendor-specific workaround beyond updating is provided in the supplied content.

Remediation

Patch, then assume compromise.

Apply Apple’s fixes by upgrading to the patched versions listed in the advisory: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.
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

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

5 SOURCESView more in app
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-2026-43734
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43734
MITRE CWE · CWE-416
cwe.mitre.org