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Use-after-free in WebKit Canvas leading to Safari crash

IdentifiersCVE-2026-43720CWE-416

CVE-2026-43720 is a use-after-free vulnerability in Apple WebKit Canvas, affecting Safari and Apple platforms that process web content. Apple states that processing maliciously crafted web content can trigger the flaw and lead to an unexpected Safari crash. The issue was addressed through improved memory management and 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 can cause Safari to crash while rendering or processing attacker-controlled web content. Based on the provided information, the documented impact is denial of service via unexpected browser termination; no confirmed evidence in the supplied content indicates code execution or data disclosure for this specific CVE.

Mitigation

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

Until patches are applied, reduce exposure to untrusted web content, especially attacker-controlled or suspicious websites that may deliver crafted content to Safari/WebKit. Where operationally feasible, limit Safari use on affected systems and prefer updated platforms/browsers. No vendor-specific workaround beyond applying the security updates is provided in the supplied content.

Remediation

Patch, then assume compromise.

Upgrade affected systems to the vendor-fixed versions: Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2. Apple indicates the vulnerability was remediated with improved memory management in WebKit Canvas.
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
+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-2026-43720
NVD
nvd.nist.gov/vuln/detail/CVE-2026-43720
MITRE CWE · CWE-416
cwe.mitre.org