What is the CVSS score of CVE-2026-43728?

CVE-2026-43728 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.1%.

Which versions of Apple are affected by CVE-2026-43728?

A vulnerability in macOS Keychain (CVE-2026-43728) allows remote unauthenticated attackers to modify Keychain state through a race condition, potentially compromising credential integrity across…. A patch is available.

How to fix or mitigate CVE-2026-43728?

Within 24 hours, identify all macOS systems below version 26.6 and begin communication for urgent patching. Over the next 7 days, deploy macOS Tahoe 26.6 to all endpoints, prioritising systems handling sensitive credentials or acting as authentication gateways. Within 30 days, verify patch compliance and review keychain access controls to mitigate any residual risk from unpatched outliers.

Apple CVE-2026-43728

EUVD-2026-49525 HIGH

Race Condition (CWE-362)

2026-07-27 apple

GHSA-vp3q-rvxq-x2ff

Race Condition Apple Information Disclosure

7.5

CVSS 3.1 · Vendor: apple

Severity by source

Vendor (apple) PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Primary rating from Vendor (apple) · only source for this CVE.

CVSS VectorVendor: apple

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Jul 28, 2026 - 22:30 vuln.today

CVSS changed

Jul 28, 2026 - 20:22 NVD

7.5 (HIGH)

Patch available

Jul 27, 2026 - 21:17 EUVD

CVE Published

Jul 27, 2026 - 20:13 cve.org

HIGH 7.5

CVE Published

Jul 27, 2026 - 20:13 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

This issue was addressed through improved state management. This issue is fixed in macOS Tahoe 26.6. An attacker may be able to modify the state of the Keychain.

AnalysisAI

Integrity modification in macOS Keychain allows remote unauthenticated attackers to modify Keychain state via a race condition. This vulnerability (CVE-2026-43728) is fixed in macOS Tahoe 26.6, with no known active exploitation but automatable according to SSVC. While CVSS rates it high severity, EPSS indicates very low likelihood of near-term exploitation.