8.7

CVE-2026-3336: amazon aws_libcrypto Improper Certificate Validation

CVSS: 8.7v4.0HighModified
AliasesGHSA-vw5v-4f2q-w9xfGHSA-cfwj-9wp5-wqvpRUSTSEC-2026-0046
Published 02-03-2026Last modified 21-08-2026
Open JSON

Vulnerability summary

CVE-2026-3336 is a high (CVSS 8.7) Improper Certificate Validation vulnerability in amazon aws_libcrypto. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.1% 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 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.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

-0.38 pp

From 0.77% 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