CVE-2026-20667

HIGHNVD 8.88.8—

8.8

A logic issue was addressed with improved checks. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, watchOS 26.3. An app may be able to break out of its sandbox.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 6.3%
KEV: Not listed

Published

February 11, 2026

Last Modified

April 2, 2026

References (5)

product-security@applehttps://support.apple.com/en-us/126346
product-security@applehttps://support.apple.com/en-us/126348
product-security@applehttps://support.apple.com/en-us/126349
product-security@applehttps://support.apple.com/en-us/126350
product-security@applehttps://support.apple.com/en-us/126352

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-693Protection Mechanism Failure

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
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2026-05-22 21:16 UTCepss_batch
2026-05-21 22:43 UTCepss_batch

Frequently asked(5)

What is CVE-2026-20667?

CVE-2026-20667 is a high vulnerability published on February 11, 2026. A logic issue was addressed with improved checks. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, watchOS 26.3. An app may be able to break out of its sandbox.

When was CVE-2026-20667 disclosed?

CVE-2026-20667 was first published in the National Vulnerability Database on February 11, 2026, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-20667 actively exploited?

CVE-2026-20667 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-20667?

CVE-2026-20667 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2026-20667?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20667, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-20667

📅 Published

🔄 Last Modified

🔗 References (5)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-20667?

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Published

Last Modified

References (5)

Frequently asked(5)

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