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CVE-2026-43666 is an out-of-bounds write vulnerability in Apple's mDNSResponder component. The flaw was addressed through improved bounds checking. It affects multiple Apple operating systems, including iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, and is reachable by an attacker on the local network. Successful triggering can cause a denial-of-service condition. Publicly available information does not provide the specific vulnerable function or code path beyond identifying mDNSResponder as the affected component.
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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.
21 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local network denial-of-service vulnerability affecting mDNSResponder.
An out-of-bounds write vulnerability in macOS Tahoe that may allow an attacker on the local network to cause a denial-of-service.
An out-of-bounds write vulnerability in Apple TV software that could allow a local-network attacker to cause denial of service.
An out-of-bounds write vulnerability in macOS Sonoma that may allow a local network attacker to cause a denial of service.
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.