8.2

CVE-2026-3337: amazon aws_libcrypto Observable Timing Discrepancy

CVSS: 8.2v4.0HighAnalyzed
AliasesGHSA-65p9-r9h6-22vjGHSA-frmv-5gcm-jwxhRUSTSEC-2026-0043
Published 02-03-2026Last modified 03-03-2026
Open JSON

Vulnerability summary

CVE-2026-3337 is a high (CVSS 8.2) Observable Timing Discrepancy vulnerability in amazon aws_libcrypto. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 41.1% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.49%
0%100%
Low · -0.58 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. 03-03-2026
    Last modifiedVulnerability information updated.

Description

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. 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

0.49%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

-0.58 pp

From 1.08% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.49%

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

Amazon3 products
Aws2 products
Crates.Io2 products
  • aws-lc-fips-sys≥ 0.13.0, < 0.13.12
  • aws-lc-sys≥ 0.14.0, < 0.38.0

3 vendors · 7 products

References

11 links
Show all 11 references