CVE-2026-110310 (GCVE-0-2026-110310)

Vulnerability from cvelistv5 – Published: 2026-10-14 19:37 – Updated: 2026-10-14 19:46
VLAI
Title
RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET
Summary
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack, the user can use a PKCS#1 v1.5 padding oracle to recover the RSA-wrapped envelope key and decrypt the object. To remediate this issue, we recommend that users upgrade to version 3.2.2 or 4.0.3. The 1.x and 2.x lines will not be patched, users of those lines need to migrate to 3.2.2 or 4.0.3.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 19:46 UTC
CWE
  • CWE-204 - Observable response discrepancy
  • CWE-757 - Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
Assigner
AMZN CNA under the mitre root
CNA scorecard A 94/100 over 135 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Amazon Amazon.Extensions.S3.Encryption Affected: 2.1.0 , ≤ 2.* (custom)
Affected: 3.0.0 , ≤ 3.2.1 (custom)
Affected: 4.0.0 , ≤ 4.0.2 (custom)
    cpe:2.3:a:amazon:amazon.extensions.s3.encryption:*:*:*:*:*:*:*:*
    cpe:2.3:a:amazon:amazon.extensions.s3.encryption:*:*:*:*:*:*:*:*
    cpe:2.3:a:amazon:amazon.extensions.s3.encryption:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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              ],
              "url": "https://www.nuget.org/packages/Amazon.Extensions.S3.Encryption/3.2.2"
            },
            {
              "tags": [
                "release-notes",
                "patch"
              ],
              "url": "https://www.nuget.org/packages/Amazon.Extensions.S3.Encryption/4.0.3"
            },
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://aws.amazon.com/security/security-bulletins/2026-135-aws/"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://github.com/aws/amazon-s3-encryption-client-dotnet/security/advisories/GHSA-322w-f6rw-r4fj"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET",
          "x_generator": {
            "engine": "Vulnogram 1.0.5"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "assignerShortName": "AMZN",
        "cveId": "CVE-2026-110310",
        "datePublished": "2026-10-14T19:37:48.420Z",
        "dateReserved": "2026-10-13T20:08:06.762Z",
        "dateUpdated": "2026-10-14T19:46:28.634Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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