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.
Published: 2026-03-19
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: Certificate Revocation Bypass
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 25 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 21 Mar 2026 05:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
References
Metrics threat_severity

None

threat_severity

Moderate


Fri, 20 Mar 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Aws
Aws aws-lc
Aws aws-lc-fips
Vendors & Products Aws
Aws aws-lc
Aws aws-lc-fips

Thu, 19 Mar 2026 21:00:00 +0000

Type Values Removed Values Added
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.
Title CRL Distribution Point Scope Check Logic Error in AWS-LC
Weaknesses CWE-299
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.1, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-03-25T14:13:42.572Z

Reserved: 2026-03-19T13:42:59.783Z

Link: CVE-2026-4428

cve-icon Vulnrichment

Updated: 2026-03-25T14:13:36.192Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-19T21:17:14.170

Modified: 2026-03-20T13:39:46.493

Link: CVE-2026-4428

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-19T20:37:53Z

Links: CVE-2026-4428 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-25T11:54:59Z

Weaknesses