CVE-2026-4428

High

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.

SeverityHigh

CVSS7.4

Exploit probability—

ProductAWS-LC

PublishedMar 19, 2026

First seenMar 19, 2026

Weakness typeCWE-299CWE-299

How to fix

Update

AWS AWS-LC1.71.0 or later
AWS AWS-LC-FIPS3.3.0 or later

Patches

github.com/aws/aws-lc/releases/tag/v1.71.0

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-010-AWS/

Affected products

Product	Affected versions	Fixed in
AWS AWS-LC	1.24.0 ≤ v < 1.71.0	1.71.0
AWS AWS-LC-FIPS	3.0.0 ≤ v < 3.3.0	3.3.0

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