What is CVE-2026-3338?

CVE-2026-3338 is a high-severity vulnerability in Aws Aws-lc, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-02.

How severe is CVE-2026-3338?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Aws Aws-lc

CVE-2026-3338

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…

EPSS: 0.000 (3.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Aws Aws-lc — versions 1.41.0

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

aws.amazon.com/security/security-bulletins/2026-005-AWS/ (vendor-advisory)
github.com/aws/aws-lc/releases/tag/v1.69.0 (patch)
github.com/aws/aws-lc/security/advisories/GHSA-jchq-39cv-q4wj (third-party-advisory)

Frequently asked questions

What is CVE-2026-3338?: CVE-2026-3338 is a high-severity vulnerability in Aws Aws-lc, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2026-03-02.
How severe is CVE-2026-3338?: High severity. CVSS v3 base score is 7.5 out of 10.