High severity · published Mar 19, 2026
CVE-2026-4428
CRL Distribution Point Scope Check Logic Error in AWS-LC
7.4
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AW
AWS-LC · AWS
1.24.0 before 1.71.0 · source: vendor
AW
AWS-LC-FIPS · AWS
3.0.0 before 3.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4428
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4428
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
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