Name: CVE-2026-4428: Improper Check for Certificate Revocation
Creator: Rapid7
Published: 2026-03-19T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-4428, CVSS 7.4, EPSS 0.00268

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 Details

CVSS 4.0 Base Score: 9.1 (CRITICAL)
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 7.4
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Amazon Linux Ami 2	—	Upgrade amazon-efs-utils	May 20, 2026	May 20, 2026
Amazon_linux_2023	—	Upgrade amazon-efs-utilsUpgrade mount-s3-debuginfoUpgrade mount-s3Upgrade mount-s3-debugsourceUpgrade aws-nitro-tpm-tools	Apr 14, 2026	Mar 19, 2026
Redhat_linux	—	No solution exists	Jul 17, 2026	Mar 19, 2026

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CVSS Details

Covered by Rapid7

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