Safari/WebKit crash on malicious web content
CVE-2026-43658 is a WebKit memory-handling vulnerability affecting Safari and Apple platforms that ship the vulnerable WebKit component. Apple states that processing maliciously crafted web content may lead to an unexpected Safari crash. The issue was addressed with improved memory handling and is fixed in Safari 26.5, iOS 26.5, iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5. Available context identifies the affected component as WebKit and references WebKit Bugzilla 307669; no more specific root cause such as use-after-free or out-of-bounds access is provided in the supplied content.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory handling issue in Apple web content processing that may cause an unexpected Safari crash via maliciously crafted web content.
A memory handling issue in Apple software for macOS Sonoma and macOS Sequoia where maliciously crafted web content may cause an unexpected Safari crash.
A WebKit vulnerability where maliciously crafted web content may cause an unexpected Safari crash.
A web content handling vulnerability in macOS Tahoe that may lead to an unexpected Safari crash.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.