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.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0074

54th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Linux
amazon-efs-utils · amzn 2023	3.0.0-4.amzn2023	ALAS2023-2026-1564	Apr 13, 2026
mount-s3 · amzn 2023	1.22.2-1.amzn2023	ALAS2023-2026-1510	Mar 30, 2026
mount-s3-debuginfo · amzn 2023	1.22.2-1.amzn2023	ALAS2023-2026-1510	Mar 30, 2026
mount-s3-debugsource · amzn 2023	1.22.2-1.amzn2023	ALAS2023-2026-1510	Mar 30, 2026
task · Fedora 43	3.4.2-3.fc43	FEDORA-2026-EB2FC8E93D	Mar 4, 2026
task-debuginfo · Fedora 43	3.4.2-3.fc43	FEDORA-2026-EB2FC8E93D	Mar 4, 2026
task-debugsource · Fedora 43	3.4.2-3.fc43	FEDORA-2026-EB2FC8E93D	Mar 4, 2026

Details

Published
March 4, 2026
Weakness
Improper Certificate Validation
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-3336

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