CVE-2025-14759 json
Amazon S3 Encryption Client for .NET has a Key Commitment Issue
published 2025-12-17 10 mo ago modified 2026-06-17 4 mo ago also GHSA-4v42-65r3-3gjx , EUVD-2025-203939
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 1%
- public exploits
- 0
- none known
Summary
Missing cryptographic key commitment in the Amazon S3 Encryption Client for .NET may allow a user with write access to the S3 bucket to introduce a new EDK that decrypts to different plaintext when the encrypted data key is stored in an "instruction file" instead of S3's metadata record.
To mitigate this issue, upgrade Amazon S3 Encryption Client for .NET to version 3.2.0 or later.
Patch / fix
- nuget Amazon.Extensions.S3.Encryption 3.2.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 10 mo ago
Exploit prediction
0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N |
| CNA | 4.0 | 6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.0 | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Amazon.Extensions.S3.Encryption | <3.2.0 |
3.2.0 |
Affected products
- AWS S3 Encryption Client for .NET
Classification
- Weakness
-
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm
References
-
github.com
/aws/amazon-s3-encryption-client-dotnet/releases/tag/release_2025-12-17
patch, web
-
github.com
/aws/amazon-s3-encryption-client-dotnet/commit/6a0272c79347b2672eea599f73ee1a94d131e899
web
-
aws.amazon.com
/security/security-bulletins/AWS-2025-032/
vendor-advisory
-
github.com
/aws/amazon-s3-encryption-client-dotnet/security/advisories/GHSA-4v42-65r3-3gjx
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2025-14759
advisory
-
aws.amazon.com
/security/security-bulletins/AWS-2025-032
web
-
github.com
/aws/amazon-s3-encryption-client-dotnet
package
Sources
- CVE List CVE-2025-14759
- GitHub Advisory GHSA-4v42-65r3-3gjx
- NVD CVE-2025-14759
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