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CVE-2026-20664 is a WebKit memory-handling vulnerability affecting Apple platforms and WebKitGTK/WPE WebKit. The issue was addressed through improved memory handling. Available technical detail indicates the flaw involved stale pointer handling associated with non-shared resizable WebAssembly memory in JavaScriptCore after memory growth, leaving a typed-array view referencing freed memory. Vendor advisories describe the observable impact as processing maliciously crafted web content leading to an unexpected process crash. Public research also associated the flaw with a broader Safari exploit chain, but the vendor-described vulnerability itself is characterized as a memory-safety issue in WebKit that can be triggered by crafted web content and results in renderer instability or crash.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.