What is the CVSS score of CVE-2026-20639?

CVE-2026-20639 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:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of macOS are affected by CVE-2026-20639?

Apple macOS versions Sequoia 15.7.4 and earlier, Sonoma 14.8.4 and earlier, and Tahoe 26.2 and earlier contain a high-severity integer overflow vulnerability that enables remote denial of service and…. A patch is available.

macOS CVE-2026-20639

EUVD-2026-15043 HIGH

Integer Overflow or Wraparound (CWE-190)

2026-03-25 apple

GHSA-7gg2-3r7f-v522

Buffer Overflow Integer Overflow Apple macOS

7.5

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:16 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

14.8.5,15.7.5,26.3

EUVD ID Assigned

Mar 25, 2026 - 01:00 euvd

EUVD-2026-15043

Analysis Generated

Mar 25, 2026 - 01:00 vuln.today

CVE Published

Mar 25, 2026 - 00:32 nvd

HIGH 7.5

DescriptionNVD

An integer overflow was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.3. Processing a maliciously crafted string may lead to heap corruption.

AnalysisAI

Integer overflow vulnerability in Apple macOS (Sequoia 15.7.4 and earlier, Sonoma 14.8.4 and earlier, Tahoe 26.2 and earlier) allows remote attackers to trigger heap corruption by processing a specially crafted string without requiring user interaction or privileges. The vulnerability results in denial of service and potential memory corruption but currently lacks a public patch. …

RemediationAI

Within 24 hours: Inventory all macOS systems running Sequoia ≤15.7.4, Sonoma ≤14.8.4, or Tahoe ≤26.2; identify business-critical systems. Within 7 days: Apply vendor-released security updates to non-production systems first (Sequoia 15.7.5+, Sonoma 14.8.5+, Tahoe 26.3+) and validate functionality. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-20639 vulnerability details – vuln.today

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macOS CVE-2026-20639

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code