Denial-of-service in Apple mDNSResponder
CVE-2026-43653 is a vulnerability in Apple's mDNSResponder component. Apple states the issue was addressed with improved memory handling. The available advisory text indicates that an attacker on the local network may be able to trigger the flaw and cause a denial-of-service condition. The issue affects Apple platforms including iOS, iPadOS, macOS, and tvOS prior to the fixed releases iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sonoma 14.8.7, macOS Tahoe 26.5, and tvOS 26.5. No further technical detail about the exact vulnerable code path or memory corruption primitive is provided in the supplied content.
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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
13 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.
A macOS Tahoe vulnerability that may allow an attacker on the local network to cause a denial-of-service.
A macOS Sonoma vulnerability that may allow an attacker on the local network to cause a denial of service.
A local-network denial-of-service vulnerability in Apple TV software addressed through improved memory handling.
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.