Bug 2449205 (CVE-2026-4428)

Summary: CVE-2026-4428 AWS-LC: AWS-LC: Security bypass allows revoked certificates to be accepted due to CRL validation error
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: anpicker, dbosanac, hasun, jfula, jowilson, jreimann, lball, mdessi, mrizzi, ngough, nyancey, ometelka, pcattana, ptisnovs, syedriko, veshanka, xdharmai
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in AWS-LC, a cryptographic library. A logic error in how the library validates Certificate Revocation List (CRL) distribution points can cause legitimate partitioned CRLs to be incorrectly rejected. This allows a revoked certificate to bypass certificate revocation checks, potentially leading to the acceptance of invalid or compromised certificates and compromising system security.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-03-19 21:02:28 UTC
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.