8.7

CVE-2026-3338: amazon aws_libcrypto

CVSS: 8.7v4.0HighModified
AliasesGHSA-hfpc-8r3f-gw53GHSA-jchq-39cv-q4wjRUSTSEC-2026-0047
Published 02-03-2026Last modified 21-08-2026
Open JSON

Vulnerability summary

CVE-2026-3338 is a high (CVSS 8.7) vulnerability in amazon aws_libcrypto. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.6% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.40%
0%100%
Low · -0.38 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-03-2026
    PublishedVulnerability first disclosed.
  2. 21-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

-0.38 pp

From 0.78% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Amazon2 products
Aws1 product
Crates.Io1 product
  • aws-lc-sys≥ 0.24.0, < 0.38.0

3 vendors · 4 products

References

13 links
Show all 13 references