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Mallory
High

Memory corruption in Apple WindowServer (macOS)

IdentifiersCVE-2025-43402CWE-119

Information currently not available to provide a detailed vulnerability description beyond the vendor advisory summary. The provided content states that CVE-2025-43402 is a WindowServer issue addressed with improved memory handling, fixed in macOS Tahoe 26.1, where a local app may be able to cause unexpected system termination or corrupt process memory.

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For your environment

Are you exposed to this one?

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ANALYST BRIEF

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.

Information currently not available beyond the vendor-provided impact statement. Per the provided content, exploitation may result in unexpected system termination (denial of service) or corruption of process memory in the WindowServer context.

Mitigation

If you can’t patch tonight, do this now.

Information currently not available in the provided content. General mitigations (not specified by the vendor here) would include reducing exposure to untrusted/local code execution (e.g., limiting ability to run untrusted apps) until patched.

Remediation

Patch, then assume compromise.

Apply the vendor fix: update to a macOS version that includes the patch (the content explicitly states the issue is fixed in macOS Tahoe 26.1).
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

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.

VendorProductType
AppleMacosoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity5

Community discussion across Reddit, Mastodon, and other social sources.