Is CVE-2022-26766 in the CISA KEV catalog?

No. CVE-2022-26766 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-26766?

CVE-2022-26766 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2022-26766?

CVE-2022-26766 has an EPSS score of 2.69% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-26766?

Upgrade ipados to 15.5 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2022-26766

MEDIUMEPSS 84th pctl

5.5

CVSS v3

NVD

Description

A certificate parsing issue was addressed with improved checks. This issue is fixed in tvOS 15.5, iOS 15.5 and iPadOS 15.5, Security Update 2022-004 Catalina, watchOS 8.6, macOS Big Sur 11.6.6, macOS Monterey 12.4. A malicious app may be able to bypass signature validation.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

ipadosNVD

Affected:< 15.5Fixed in:15.5CVE-2022-26766derived from NVD

iphone osNVD

Affected:< 15.5Fixed in:15.5CVE-2022-26766derived from NVD

mac os xNVD

Affected:< 10.15.7Fixed in:10.15.7CVE-2022-26766derived from NVD

macosNVD

Affected:>= 12.0, < 12.4Fixed in:12.4CVE-2022-26766derived from NVD

tvosNVD

Affected:< 15.5Fixed in:15.5CVE-2022-26766derived from NVD

watchosNVD

Affected:< 8.6Fixed in:8.6CVE-2022-26766derived 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 RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

2.69%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Vendor Advisory6

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	83%	KEV	Fix
CVE-2023-27823	Critical	9.8	53%	-	-
CVE-2022-42979	High	8.8	24%	-	-

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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 2025-05-30.