CVE-2026-4428
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 17% of all known CVEs.
References
Related Vulnerabilities
Other CWE-299 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-1675 | High | 8.3 | 0.6% | - | Fix |
| CVE-2020-16228 | Medium | 6.4 | 0.4% | - | - |
| CVE-2025-3085 | High | 8.1 | 0.3% | - | Fix |
| CVE-2025-11955 | Unscored | - | 0.3% | - | - |
| CVE-2023-23690 | High | 7.0 | 0.2% | - | Fix |
| CVE-2025-36057 | Medium | 5.2 | 0.2% | - | Fix |
Common questions
How do I fix CVE-2026-4428?
No published fix for CVE-2026-4428 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-4428 being actively exploited?
Not that we know of. CVE-2026-4428 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.25% is the estimated probability that it will be exploited in the next 30 days. That is higher than 17% of all scored CVEs.
How severe is CVE-2026-4428?
CVE-2026-4428 has a CVSS v3 base score of 7.4, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-20.