Vulnerability details

CVE-2026-4428

AWS AWS-LCAWS AWS-LC-FIPS

CRL Distribution Point Scope Check Logic Error in AWS-LC

CVSS 4.0

9.1Critical

Official 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 scores

Score	Version	Source	Vector
9.1Critical	4.0	CVEProject cvelistV5 (CNA) (AMZN)	`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`
7.4High	3.1	CVEProject cvelistV5 (CNA) (AMZN)	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
AWS	AWS-LC	1.24.0 ≤ v < 1.71.0	CVEProject cvelistV5 (CNA)
AWS	AWS-LC-FIPS	3.0.0 ≤ v < 3.3.0	CVEProject cvelistV5 (CNA)

References and advisories

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

Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-03-20
Last updated: 2026-03-25
State: Published
Assigner (CNA): AMZN

Exploit prediction (EPSS)

0.25%

Probability of exploitation in 30 days

17.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-299
Improper check for certificate revocation