TI-2026-03840 Aliases CVE-2026-4428

CRL Distribution Point Scope Check Logic Error in AWS-LC

MEDIUM 41CWE-299Published 2026-03-19 · Updated 2026-03-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Partial Red Hat: 8 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00257 17th percentileScored 2026-11-07

Fix Partial AWS-LC (AWS): 1.71.0AWS-LC-FIPS (AWS): 3.3.0Red Hat: 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	AWS-LC	1.24.0 to before 1.71.0	1.71.0	Patch available	CNA
AWS	AWS-LC-FIPS	3.0.0 to before 3.3.0	3.3.0	Patch available	CNA

AWS-LC VendorAWS Affected 1.24.0 to before 1.71.0 Fixed in 1.71.0 Patch available CNA
AWS-LC-FIPS VendorAWS Affected 3.0.0 to before 3.3.0 Fixed in 3.3.0 Patch available CNA

Remediation

Fix · CNA AWS-LC (AWS) Fixed in 1.71.0
Fix · CNA AWS-LC-FIPS (AWS) Fixed in 3.3.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Confidential Compute Attestation	Affected	No fix yet: Fix deferred
OpenShift Lightspeed	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred
Red Hat OpenShift Update Service	Affected	No fix yet: Fix deferred
Red Hat Trusted Artifact Signer	Affected	No fix yet: Fix deferred
Red Hat Trusted Profile Analyzer	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-4428

References

Patch 1

https://github.com/aws/aws-lc/releases/tag/v1.71.0

Advisory 1

https://aws.amazon.com/security/security-bulletins/2026-010-AWS/

TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9

See all 383 →

Sources

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