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

IdentifiersCVE-2026-43726CWE-416

CVE-2026-43726 is a use-after-free vulnerability in Apple Safari/WebKit web content processing. According to the provided Apple security notice, the issue was addressed through improved memory management. A remote attacker could trigger the flaw by causing the target to process maliciously crafted web content. Apple states the observable impact is an unexpected process 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.

Successful exploitation may cause the affected web content process or Safari-related process to crash unexpectedly, resulting in denial of service for the browsing session. Based on the provided content, there is no specific evidence that Apple confirmed code execution, privilege escalation, or data disclosure for this CVE; the stated impact is process crash.

Mitigation

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

If immediate patching is not possible, reduce exposure by limiting access to untrusted or attacker-controlled web content and restricting browsing from affected devices until updates can be applied. Because the vulnerability is triggered during web content processing, standard temporary mitigations include minimizing use of the affected browser components and isolating high-risk browsing activity. No vendor-specific mitigation beyond updating was provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade affected systems to the patched releases identified by Apple: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2. Apple indicates the issue was remediated with improved memory management.
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.

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.

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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-2026-43726
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43726
MITRE CWE · CWE-416
cwe.mitre.org