# CVE-2026-3336: PKCS7_verify Certificate Chain Validation Bypass in AWS-LC

CVE-2026-3336 is fixed in 7 products on 1 platform, first by FEDORA-2026-EB2FC8E93D, released March 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-3336
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 4, 2026
- Weakness: Improper Certificate Validation
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3336

## Description

Update to new release, includes updated dependencies that fix for a number of CVEs

## 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 | mount-s3 amzn 2023 | 1.22.2-1.amzn2023 | [ALAS2023-2026-1510](https://patchblox.com/security/data/fix/linux/alas2023-2026-1510.md) | Mar 30, 2026 |
| Linux | mount-s3-debuginfo amzn 2023 | 1.22.2-1.amzn2023 | [ALAS2023-2026-1510](https://patchblox.com/security/data/fix/linux/alas2023-2026-1510.md) | Mar 30, 2026 |
| Linux | mount-s3-debugsource amzn 2023 | 1.22.2-1.amzn2023 | [ALAS2023-2026-1510](https://patchblox.com/security/data/fix/linux/alas2023-2026-1510.md) | Mar 30, 2026 |
| Linux | task Fedora 43 | 3.4.2-3.fc43 | [FEDORA-2026-EB2FC8E93D](https://patchblox.com/security/data/fix/linux/fedora-2026-eb2fc8e93d.md) | Mar 4, 2026 |
| Linux | task-debuginfo Fedora 43 | 3.4.2-3.fc43 | [FEDORA-2026-EB2FC8E93D](https://patchblox.com/security/data/fix/linux/fedora-2026-eb2fc8e93d.md) | Mar 4, 2026 |
| Linux | task-debugsource Fedora 43 | 3.4.2-3.fc43 | [FEDORA-2026-EB2FC8E93D](https://patchblox.com/security/data/fix/linux/fedora-2026-eb2fc8e93d.md) | Mar 4, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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