Traffic interception (MITM) via logic issue in Apple Kernel/libnetcore
CVE-2026-20671 is a logic flaw in Apple’s networking stack components (reported in Apple advisories as affecting both the Kernel and libnetcore) that was addressed by “improved checks.” Apple indicates that an attacker in a privileged network position may be able to intercept network traffic, implying improper verification/validation in network-path security handling that can enable man-in-the-middle style interception. The issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, macOS Sonoma 14.8.4, macOS Sequoia 15.7.4, iOS 18.7.5/iPadOS 18.7.5, visionOS 26.3, and iOS 26.3/iPadOS 26.3.
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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
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Kernel issue enabling network traffic interception by an on-path/privileged network attacker.
Privacy issue allowing enumeration of installed apps via logging; fixed by sanitizing logs.
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.