CVE-2025-43366
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Tahoe 26. An app may be able to disclose coprocessor memory.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceAn out-of-bounds read vulnerability in macOS allows a malicious application to read beyond allocated memory boundaries and disclose coprocessor memory. This memory disclosure issue is addressed with improved bounds checking in macOS Tahoe 26.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 26.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify macOS versionRun 'sw_vers -productVersion' in Terminal or go to System Settings > AboutAffected if The version displayed is below 26.0 (e.g., 25.x, 24.x, etc.)
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Confirm build numberRun 'sw_vers -buildVersion' to see the specific buildAffected if Running a build associated with versions prior to macOS Tahoe 26
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Verify macOS marketing nameCheck System Settings > About for the marketing name (e.g., Sequoia, Sonoma)Affected if The system is running any version named Sequoia, Sonoma, Ventura, or earlier rather than Tahoe 26
The environment is affected if the installed macOS version is any release prior to version 26.0 (Tahoe 26).
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped26.0
Update affected macOS systems to version Tahoe 26 or later to apply the bounds checking fix that prevents unauthorized coprocessor memory disclosure.
macOS Tahoe 26.0
- Back up your Mac using Time Machine or another backup solution before proceeding with the update
- Connect your Mac to a power source to ensure the update completes without interruption
- Open System Settings (or System Preferences on older macOS versions)
- Click on 'General' in the sidebar
- Select 'Software Update'
- Wait for macOS to check for available updates
- Click 'Update Now' or 'Upgrade Now' next to macOS Tahoe 26.0
- Follow the on-screen instructions to download and install the update
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-43366 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-43366 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data