Is CVE-2026-43740 in the CISA KEV catalog?

No. CVE-2026-43740 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43740?

CVE-2026-43740 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-43740?

CVE-2026-43740 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43740?

Upgrade Safari to 26.5.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-43740

MEDIUM

6.5

CVSS v3

NVD

Description

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may result in the disclosure of process memory.

CWE-119Buffer Overflow CWE-416Use After Free

How to fix

Remediation Available

SafariWindows application

Affected:26.5.2Fixed in:26.5.2Apple Inc.

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory3

Embed a live status badge for CVE-2026-43740

Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-30.