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CVE-2026-3337

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

CVSS 3.1 5.9 MEDIUMCVSS 4.0 8.2 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-3337

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-3337

Published

AWS-LC

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "AWS-LC",
                    "vendor": "AWS",
                    "versions": [
                        {
                            "lessThan": "1.69.0",
                            "status": "affected",
                            "version": "1.21.0",
                            "versionType": "custom"
                        }
                    ]
                }

AWS-LC-FIPS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "AWS-LC-FIPS",
                    "vendor": "AWS",
                    "versions": [
                        {
                            "lessThan": "3.2.0",
                            "status": "affected",
                            "version": "3.0.0",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON