Vulnerability · Published Mar 2, 2026 · Assigned by AMZN
CVE-2026-3338PKCS7_verify Signature Validation Bypass in AWS-LC
High 7.5
In plain English
A high-severity security flaw in AWS-LC from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 44.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 products (as reported)
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References
- https://aws.amazon.com/security/security-bulletins/2026-005-AWS/ vendor-advisory
- https://github.com/aws/aws-lc/releases/tag/v1.69.0 patch
- https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-3338 vdb-entry, x_refsource_REDHAT
- RHBZ#2444025 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3338.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:5459 vendor-advisory, x_refsource_REDHAT