CVE-2026-3336highCWE-295

PKCS7_verify Certificate Chain 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 certificate validation in PKCS7_verify() in AWS-LC allows an unauthenticated user to bypass certificate chain verification when processing PKCS7 objects with multiple signers, except the final signer. 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-2026-3336 https://aws.amazon.com/security/security-bulletins/2026-005-AWS/https://bugzilla.redhat.com/show_bug.cgi?id=2444026 https://github.com/aws/aws-lc/releases/tag/v1.69.0 https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvp https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json