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Use-after-free in Safari web content processing

IdentifiersCVE-2026-43717CWE-416

CVE-2026-43717 is a use-after-free vulnerability in Apple Safari/WebKit web content processing. According to the provided Apple security information, the flaw was addressed through improved memory management and can be triggered when Safari processes maliciously crafted web content. Successful triggering leads to 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.

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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.

Processing maliciously crafted web content may cause Safari to crash unexpectedly. Based on the provided information, the documented impact is denial of service at the browser/process level rather than confirmed code execution or data disclosure.

Mitigation

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

Until updates can be applied, reduce exposure by limiting access to untrusted or attacker-controlled websites and web content. Because the issue is triggered during processing of maliciously crafted web content, standard browser hardening and minimizing browsing to untrusted sites may reduce risk, but the primary mitigation is installing Apple's fixes.

Remediation

Patch, then assume compromise.

Upgrade to the patched versions identified by Apple: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2, as applicable to the affected device or platform.
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

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

3 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 activity

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

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-43717
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43717
MITRE CWE · CWE-416
cwe.mitre.org