Cryptographic Key Commitment Vulnerability in Amazon S3 Encryption Client for .NET
CVE-2025-14759

6MEDIUM

Key Information:

Vendor

Aws

Status
S3 Encryption Client For .net
Vendor
CVE Published:
17 December 2025

What is CVE-2025-14759?

The Amazon S3 Encryption Client for .NET, an open-source library enabling encryption for records stored in S3, is affected by a security flaw. This vulnerability arises from a missing cryptographic key commitment, which could allow a user with write access to an S3 bucket to manipulate encrypted data keys. Specifically, if the encrypted data key is stored in an 'instruction file' rather than S3's metadata, it could decrypt to incorrect plaintext. To protect sensitive data, users are advised to upgrade to version 3.2.0 or later.

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Deploy the Patch

Affected Version(s)

S3 Encryption Client for .NET 3.2.0

References

https://aws.amazon.com/security/security-bulletins/AWS-20...
vendor-advisory
https://github.com/aws/amazon-s3-encryption-client-dotnet...
third-party-advisory
https://github.com/aws/amazon-s3-encryption-client-dotnet...
patch

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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