What is the CVSS score of EUVD-2026-49463?

EUVD-2026-49463 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a patch available for EUVD-2026-49463?

Yes, a patch is available for EUVD-2026-49463. Update the affected software to the latest version immediately.

macOS EUVD-2026-49463

| CVE-2026-43757 CRITICAL

Out-of-bounds Read (CWE-125)

2026-07-27 apple

GHSA-whqr-78r5-cq67

Buffer Overflow Information Disclosure Apple

9.8

CVSS 3.1 · Vendor: apple

Severity by source

Vendor (apple) PRIMARY

9.8 CRITICAL

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

vuln.today AI

5.5 MEDIUM

Requires a local app to trigger, so AV:L and PR:L; only system termination occurs, so C:N/I:N/A:H.

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

4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 28, 2026 - 15:33 vuln.today

Patch available

Jul 27, 2026 - 21:17 EUVD

CVE Published

Jul 27, 2026 - 20:15 cve.org

CRITICAL 9.8

CVE Published

Jul 27, 2026 - 20:15 cve.org

UNKNOWN (no severity yet)

DescriptionCVE.org

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause unexpected system termination.

AnalysisAI

Out-of-bounds read in macOS allows a malicious app to trigger unexpected system termination. Patches are available in macOS Sequoia 15.7.8, Sonoma 14.8.8, and Tahoe 26.6. No active exploitation or public exploit code has been identified, and EPSS indicates low probability of widespread exploitation.

Technical ContextAI

The vulnerability arises from an out-of-bounds read (CWE-125) in macOS, likely within a kernel or system library component that processes input from user-space applications. An app can cause memory access beyond an allocated buffer, leading to a crash or unexpected behavior. The issue was addressed by improving bounds checking. Affected products are all versions of macOS prior to the fixed releases, as identified by CPE: cpe:2.3:a:apple:macos.

RemediationAI

Upgrade to macOS Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6 as appropriate for the device. If immediate patching is not feasible, restrict app installation to trusted sources (e.g., App Store only) to reduce the likelihood of running a malicious app that could trigger the vulnerability. No other workarounds are indicated in available advisories.