CVE-2026-4428

CRL Distribution Point Scope Check Logic Error in AWS-LC

State: Published
Severity: 9.1 Critical
Published: Mar 19, 2026
Updated: Mar 25, 2026
Reserved: Mar 19, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.1 Critical	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	AMZN
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	AMZN

Weaknesses

CWE-299 Improper check for certificate revocation

Affected Products

Product	Versions
AWS-LCAWS	1.24.0 to before 1.71.0Affected
AWS-LC-FIPSAWS	3.0.0 to before 3.3.0Affected

References

https://aws.amazon.com/security/security-bulletins/2026-010-AWS/vendor-advisory
https://github.com/aws/aws-lc/releases/tag/v1.71.0patch

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