Is CVE-2026-4428 in the CISA KEV catalog?

No. CVE-2026-4428 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-4428?

CVE-2026-4428 has a CVSS v3 base score of 7.4 (HIGH).

What is the EPSS score for CVE-2026-4428?

CVE-2026-4428 has an EPSS score of 0.25% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-4428?

No published fix for CVE-2026-4428 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-4428

HIGH

7.4

CVSS v3

NVD

Description

A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly rejected as out of scope, which allows a revoked certificate to bypass certificate revocation checks. To remediate this issue, users should upgrade to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.

CWE-299

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.25%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-299 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-1675	High	8.3	0.6%	-	Fix
CVE-2020-16228	Medium	6.4	0.4%	-	-
CVE-2025-3085	High	8.1	0.3%	-	Fix
CVE-2025-11955	Unscored	-	0.3%	-	-
CVE-2023-23690	High	7.0	0.2%	-	Fix
CVE-2025-36057	Medium	5.2	0.2%	-	Fix

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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 2026-03-20.