CVE-2026-3338highCWE-347

PKCS7_verify Signature Validation Bypass in AWS-LC

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.7epss 0.8%

exploitation probability

0.8%top 48% of all CVEs

observed exploitation

nono source reports it

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Affected products

AWS · AWS-LC

References

https://access.redhat.com/errata/RHSA-2026:5459 https://access.redhat.com/security/cve/CVE-2026-3338 https://aws.amazon.com/security/security-bulletins/2026-005-AWS/https://bugzilla.redhat.com/show_bug.cgi?id=2444025 https://github.com/aws/aws-lc/releases/tag/v1.69.0 https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3338.json