Improper Certificate Validation Affecting aws-lc-fips-sys package, versions >=0.13.0 <0.13.13
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Mar 2026
- disclosed20 Mar 2026
- creditUnknown
Introduced: 20 Mar 2026
NewCVE-2026-4428 (opens in a new tab)How to fix?
Upgrade aws-lc-fips-sys to version 0.13.13 or higher.
Overview
Affected versions of this package are vulnerable to Improper Certificate Validation in the certificate revocation list (CRL) distribution point matching. An attacker can bypass certificate revocation checks by presenting a revoked certificate when CRL checking is enabled and partitioned CRLs with Issuing Distribution Point (IDP) extensions are used.
Note: This is only exploitable if CRL checking is enabled and partitioned CRLs with IDP extensions are in use.
Workaround
This vulnerability can be mitigated by disabling CRL checking or by using complete (non-partitioned) CRLs without IDP extensions.