CVE-2026-3336

Name: CVE-2026-3336
Creator: NVD / NIST
Published: 2026-03-02T22:16:31.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.7/10EPSS 0.68%

Last modified Jun 17, 2026

CVE-2026-3336 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

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.

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

0.68%

47.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

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-cfwj-9wp5-wqvpVendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-3336?

How severe is CVE-2026-3336?

CVE-2026-3336 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2026-3336?

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-2026-3336?

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

Scan your code now

Source: NVD / NIST