CVE-2026-3336

high

Description

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.

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/

https://aws.amazon.com/security/security-bulletins/rss/2026-005-aws/

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3336.json

https://github.com/aws/aws-lc/security/advisories/GHSA-cfwj-9wp5-wqvp

https://github.com/aws/aws-lc/releases/tag/v1.69.0

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-9264

https://bugzilla.redhat.com/show_bug.cgi?id=2444026

https://access.redhat.com/security/cve/CVE-2026-3336

https://access.redhat.com/errata/RHSA-2026:5459

Details

Source: Mitre, NVD

Published: 2026-03-02

Updated: 2026-07-15

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Severity: High

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High

EPSS

EPSS: 0.00395