CVE-2026-3338 describes an improper signature validation vulnerability in the PKCS7_verify() function of AWS-LC, allowing an unauthenticated attacker to bypass signature verification when processing PKCS7 objects with Authenticated Attributes. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity that can lead to high integrity impact without user interaction. While AWS service customers are not impacted, applications utilizing AWS-LC should upgrade to version 1.69.0. There is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV listing, but the vulnerability has garnered significant community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.24.0, < 0.38.0CPE matchmatch criteria | cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:* | ||
>= 1.41.0, < 1.69.0CPE matchmatch criteria | cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
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
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.