CVE-2026-4428 describes a logic error in AWS-LC versions prior to 1.71.0 that causes partitioned Certificate Revocation Lists (CRLs) to be incorrectly rejected, allowing revoked certificates to bypass revocation checks. This vulnerability carries a CVSS score of 7.4 (High), indicating a network-based attack with high impact on confidentiality and integrity, though requiring high attack complexity. Currently, there is no evidence of active exploitation, and no public exploit code is available on platforms like Metasploit or ExploitDB. While not on CISA's KEV catalog, the issue has received minimal community discussion, and remediation requires upgrading to AWS-LC 1.71.0 or AWS-LC-FIPS-3.3.0.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
| AWS | AWS-LC | >= 1.24.0, < 1.71.0CNA affecteddefault unaffected | |
| AWS | AWS-LC-FIPS | >= 3.0.0, < 3.3.0CNA affecteddefault unaffected |
CVSS version used by this source: 4.0
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
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.