CVE-2026-4428— CRL Distribution Point Scope Check Logic Error in AWS-LC
Quick assessment
Affected
AWS AWS-LC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
AWS libcrypto是Amazon Web Services开源的一个通用加密库。 AWS libcrypto 1.71.0之前版本存在安全漏洞，该漏洞源于CRL分发点验证中的逻辑错误导致分区的CRL被错误地拒绝为超出范围，从而允许已吊销的证书绕过证书吊销检查。
Possible ATT&CK Techniques 1 AI
T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-4428
Vulnerability Information
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Vulnerability Title
CRL Distribution Point Scope Check Logic Error in AWS-LC
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书撤销验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
AWS libcrypto 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AWS libcrypto是Amazon Web Services开源的一个通用加密库。 AWS libcrypto 1.71.0之前版本存在安全漏洞，该漏洞源于CRL分发点验证中的逻辑错误导致分区的CRL被错误地拒绝为超出范围，从而允许已吊销的证书绕过证书吊销检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| AWS | AWS-LC | 1.24.0 ~ 1.71.0 | - |
|
| AWS | AWS-LC-FIPS | 3.0.0 ~ 3.3.0 | - |
|
II. Public POCs for CVE-2026-4428
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-4428 (1)
Vendor Pages for CVE-2026-4428 (1)
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V. Comments for CVE-2026-4428
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