CVE-2026-3338CWE-347

PKCS7_verify Signature Validation Bypass in AWS-LC

High · published March 2, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
33.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
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
EPSS
0.00408 · 33.9th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-03-02T21:22Z
EPSS history
Timeline
  • 02 MAR 21:22Z
    PKCS7_verify Signature Validation Bypass in AWS-LC
    cvelistv5