CVE-2026-3336 PKCS7_verify Certificate Chain Validation Bypass in AWS

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CVE-2026-3336 PKCS7_verify Certificate Chain Validation Bypass in AWS

Api.Msrc.Microsoft • March 5, 2026

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple PKCS7_verify Vulnerabilities Discovered in AWS Two critical vulnerabilities, CVE-2026-3336 and CVE-2026-3338, affecting AWS have been published, both on March 2, 2026. CVE-2026-3336 allows a certificate chain validation bypass, while CVE-2026-3338 enables a signature validation bypass, potentially exposing users to significant security risks. 2 sources 67

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