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.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Wed, 14 Oct 2026 21:30:00 +0000
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| Metrics |
ssvc
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Wed, 14 Oct 2026 20:00:00 +0000
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| References |
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Wed, 14 Oct 2026 19:45:00 +0000
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| Description | 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. | |
| Title | RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET | |
| First Time appeared |
Amazon
Amazon amazon.extensions.s3.encryption |
|
| Weaknesses | CWE-204 CWE-757 |
|
| CPEs | cpe:2.3:a:amazon:amazon.extensions.s3.encryption:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Amazon
Amazon amazon.extensions.s3.encryption |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: AMZN
Published:
Updated: 2026-10-14T19:46:28.634Z
Reserved: 2026-10-13T20:08:06.762Z
Link: CVE-2026-110310
Updated: 2026-10-14T19:46:11.197Z
Status : Received
Published: 2026-10-14T20:17:30.547
Modified: 2026-10-14T20:17:30.547
Link: CVE-2026-110310
No data.
OpenCVE Enrichment
No data.