CVE-2026-3338

Summary

Improper signature validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass signature verification when processing PKCS7 objects with Authenticated Attributes.

Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

Affected Software

Weaknesses

• CWE-347: CWE-347 (Improper Verification of Cryptographic Signature)

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

aws-lc: AWS-LC: Signature bypass due to improper validation in PKCS7_verify()

Additional References

• https://access.redhat.com/security/cve/CVE-2026-3338
• https://bugzilla.redhat.com/show_bug.cgi?id=2444025
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3338.json
• https://access.redhat.com/errata/RHSA-2026:5459

References

• https://aws.amazon.com/security/security-bulletins/2026-005-AWS/
• https://github.com/aws/aws-lc/releases/tag/v1.69.0
• https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj

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