# CVE-2026-4428: amazon-efs-utils: A logic error in CRL distribution point validation in AWS-LC before 1.71.0 causes partitioned CRLs to be incorrectly...

CVE-2026-4428 is fixed in 5 products on 1 platform, first by ALAS2023-2026-1564, released April 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-4428
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 13, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amazon-efs-utils amzn 2023 | 3.0.0-4.amzn2023 | [ALAS2023-2026-1564](https://patchblox.com/security/data/fix/linux/alas2023-2026-1564.md) | Apr 13, 2026 |
| Linux | aws-nitro-tpm-tools amzn 2023 | 1.1.2-1.amzn2023 | [ALAS2023-2026-1905](https://patchblox.com/security/data/fix/linux/alas2023-2026-1905.md) | Jul 6, 2026 |
| Linux | mount-s3 amzn 2023 | 1.22.3-1.amzn2023 | [ALAS2023-2026-1655](https://patchblox.com/security/data/fix/linux/alas2023-2026-1655.md) | May 11, 2026 |
| Linux | mount-s3-debuginfo amzn 2023 | 1.22.3-1.amzn2023 | [ALAS2023-2026-1655](https://patchblox.com/security/data/fix/linux/alas2023-2026-1655.md) | May 11, 2026 |
| Linux | mount-s3-debugsource amzn 2023 | 1.22.3-1.amzn2023 | [ALAS2023-2026-1655](https://patchblox.com/security/data/fix/linux/alas2023-2026-1655.md) | May 11, 2026 |

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Data as of 2026-11-11T13:47:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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