CVE-2026-4428

DiscoveredMar 19, 2026UpdatedMar 20, 2026

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.

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CVSS v3.1

7.4 HIGH

EPSS

0.26%

probability of exploitation in 30 days

CISA KEV

Not listed

no confirmed exploitation reported

News coverage

sources referencing this CVE

Related IOCs

seen in the same coverage

EPSS Trend

Sep 25, 2026 → Oct 26, 2026

● 0.00pp

0.26% → 0.26% over 3 tracked changes

CVSS v3.1 Detail

Attack VectorNETWORK

Attack ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

ScopeUNCHANGED

ConfidentialityHIGH

IntegrityHIGH

AvailabilityNONE

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

Connections

2 relationships

CWE-299

source

Timeline

disclosure → media coverage

Mar 19, 2026

Disclosure — published as a CVE record.

Aug 20, 2026

aws.amazon.com reports: CVE-2026-4428: Issues with AWS-LC - CRL Distribution Point Scope Check Logic Error