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MEDIUM severity

CVE-2023-51651 — aws-sdk-php

MEDIUMFix: aws/aws-sdk-php@aebc9f8

CVE-2023-51651 is a medium-severity (CVSS 6) Path Traversal vulnerability in aws/aws-sdk-php. A fix is available for aws/aws-sdk-php — see the affected versions and patch details below.

Potential URI resolution path traversal in the AWS SDK for PHP

Also known asCVE-2025-69820GHSA-557v-xcg6-rm5mGHSA-73jg-4qh6-3f4gGO-2026-4390
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs32th percentile — riskier than 32% of all scored CVEsHighest risk
0.00%0.29%0.58%0.88%0.1%0.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘aws/aws-sdk-php

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Within the scope of requests to S3 object keys and/or prefixes containing a Unix double-dot, a URI path traversal is possible. The issue exists in thebuildEndpoint method in the RestSerializer component of the AWS SDK for PHP v3 prior to 3.288.1. The buildEndpoint method relies on the Guzzle Psr7 UriResolver utility, which strips dot segments from the request path in accordance with RFC 3986. Under certain conditions, this could lead to an arbitrary object being accessed.

Versions of the AWS SDK for PHP v3 before 3.288.1 are affected by this issue.

Patches

Upgrade to the AWS SDK for PHP >= 3.288.1, if you are on version < 3.288.1.

References

RFC 3986 - https://datatracker.ietf.org/doc/html/rfc3986

For more information

If you have any questions or comments about this advisory, please contact AWS's Security team.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistaws/aws-sdk-phpall versions3.288.1composer require aws/aws-sdk-php:^3.288.1

Affected Products

1 product · 1 configurations
Application
aws software development kitamazon
< 3.288.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aws/aws-sdk-php, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update aws/aws-sdk-php to 3.288.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-51651 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

### Impact Within the scope of requests to S3 object keys and/or prefixes containing a Unix double-dot, a URI path traversal is possible. The issue exists in the`buildEndpoint` method in the `RestSerializer` component of the AWS SDK for PHP v3 prior to 3.288.1. The `buildEndpoint` method relies on the Guzzle Psr7 `UriResolver` utility, which strips dot segments from the request path in accordance with RFC 3986. Under certain conditions, this could lead to an arbitrary object being accessed. Versions of the AWS SDK for PHP v3 before 3.288.1 are affected by this issue. ### Patches Upgrade to t
O3 Security · Impact-Aware SCA

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CVE-2023-51651: aws-sdk-php — Fixed in 3.288.1