CVE-2026-3338

Name: CVE-2026-3338
Creator: NVD / NIST
Published: 2026-03-02T22:16:32.35+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2026-3338 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

CVSS 4.0

8.7/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.70%

48.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Amazon	Aws-Lc-Sys	>= 0.24.0, < 0.38.0
Amazon	Aws Libcrypto	>= 1.41.0, < 1.69.0

References

https://aws.amazon.com/security/security-bulletins/2026-005-AWS/Vendor Advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0Release Notes
https://github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wjVendor Advisory

Timeline

Published: Mar 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3338?

How severe is CVE-2026-3338?

CVE-2026-3338 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3338?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3338?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST