CVE-2026-20618

Q: How do I fix CVE-2026-20618?

Upgrade macos to 26.3 or later.

Q: Is CVE-2026-20618 being actively exploited?

Not that we know of. CVE-2026-20618 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.

Q: How severe is CVE-2026-20618?

CVE-2026-20618 has a CVSS v3 base score of 5.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-20618 affect?

Published advisories record a fix for macos (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.5

CVSS v3

NVD

Description

An issue was addressed with improved handling of temporary files. This issue is fixed in macOS Tahoe 26.3. An app may be able to access user-sensitive data.

CWE-377

How to fix

Remediation Available

macosNVD

Affected:< 26.3Fixed in:26.3CVE-2026-20618derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Vendor Advisory1

support.apple.com

Related Vulnerabilities

Other CWE-377 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-5224	Critical	9.8	4.5%	-	Fix
CVE-2026-20204	High	7.1	3.3%	-	Fix
CVE-2018-3710	High	7.8	2.9%	-	Fix
CVE-2017-16024	Medium	6.5	2.6%	-	Fix
CVE-2012-2666	Critical	9.8	1.9%	-	-
CVE-2018-16494	High	8.8	1.9%	-	Fix

Common questions

How do I fix CVE-2026-20618?

Upgrade macos to 26.3 or later.

Is CVE-2026-20618 being actively exploited?

Not that we know of. CVE-2026-20618 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.13% is the estimated probability that it will be exploited in the next 30 days. That is higher than 3% of all scored CVEs.

How severe is CVE-2026-20618?

CVE-2026-20618 has a CVSS v3 base score of 5.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-20618 affect?

Published advisories record a fix for macos (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-20618

Markdown

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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 2026-02-18.