CVE-2026-4428

CRITICAL EPSS 16.4%

Published Mar 19, 20263mo ago · Modified Mar 20, 20263mo ago

9.1 CVSS 4.0

Critical

Published Mar 19, 2026 3mo ago

Last Modified Mar 20, 2026 3mo ago

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.

CVSS Details

Base Score

9.1

Exploitability

—

Impact

—

Vector string

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

Attack Vector Network

Attack Complexity High

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

16.4% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-299

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.