Description
Missing cryptographic key commitment in the Amazon S3 Encryption Client for Go 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 Go to version 4.0 or later.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| AWS | S3 Encryption Client for Go | — | 4.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20251230T014957-150000.1.134.1 | SUSE-SU-2026:0037-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/aws/amazon-s3-encryption-client-go | all versions | — | GO-2025-4250 |
| Go | github.com/aws/amazon-s3-encryption-client-go/v3 | < 4.0.0 | 4.0.0 | GHSA-3g75-q268-r9r6 |
| Go | github.com/aws/amazon-s3-encryption-client-go/v3 | all versions | — | GO-2025-4250 |
| Go | github.com/aws/amazon-s3-encryption-client-go/v4 | < 4.0.0 | 4.0.0 | GO-2025-4250 |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0037-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 23, 2026