Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The AWS SDK for PHP's S3 Encryption Client, in aws/aws-sdk-php versions before 3.368.0, is vulnerable to a key commitment weakness when encrypted data keys are stored in an Instruction File. An attacker who can upload a new Instruction File to the same S3 bucket, and who can create a rogue encrypted data key, could cause the client to decrypt the object with that key and return attacker-chosen plaintext. Upgrade to aws/aws-sdk-php 3.368.0 or later, as the source states there are no workarounds.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.0 | Medium | 4.0 | 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 (AMZN) |
- CISA KEV Not listed.
- EPSS 0.0021, the 11th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:02 UTC First seen by agentprime
- 31 Oct 2026, 14:02 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-x8cp-jf6f-r4xh
- OSV: GHSA-x8cp-jf6f-r4xh
- github.com/aws/aws-sdk-php/security/advisories/GHSA-x8cp-jf6f-r4xh
- nvd.nist.gov/vuln/detail/CVE-2025-14761
- github.com/aws/aws-sdk-php/commit/6827cac70397dca07e6e86f7cf630954ec2bc6bf
- aws.amazon.com/security/security-bulletins/AWS-2025-032
- github.com/FriendsOfPHP/security-advisories/blob/master/aws/aws-sdk-php/CVE-2025-14761.yaml
- github.com/aws/aws-sdk-php
- github.com/aws/aws-sdk-php/releases/tag/3.368.0