CVE-2026-4428 PUBLISHED

CRL Distribution Point Scope Check Logic Error in AWS-LC

Assigner: AMZN
Reserved: 19.03.2026 Published: 19.03.2026 Updated: 19.03.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 7.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

CVSS 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
CVSS Score: 9.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	AWS
Product	AWS-LC
Versions	Default: unaffected affected from 1.24.0 to 1.71.0 (excl.)

Vendor	AWS
Product	AWS-LC-FIPS
Versions	Default: unaffected affected from 3.0.0 to 3.3.0 (excl.)

CVE-2026-4428 PUBLISHED

CRL Distribution Point Scope Check Logic Error in AWS-LC

Metrics

Product Status

References

Problem Types

Impacts