Potential URI resolution path traversal in the AWS SDK for PHP

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.0 · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

EPSS

• CVE-2023-51651: 0.38% estimated exploitation activity in the next 30 days; percentile 31.67 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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.

Published by the source

21 Dec 2023, 23:16 UTC

Last modified by the source

8 Jan 2024, 15:46 UTC

Source last checked

26 Oct 2026, 14:14 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-557v-xcg6-rm5m

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# Patch Next advisory brief: CVE-2023-51651

Advisory: Potential URI resolution path traversal in the AWS SDK for PHP
IDs: CVE-2023-51651, GHSA-557v-xcg6-rm5m
Record: https://patchnext.com/advisories/cve-2023-51651 (revision 1, source checked 26 Oct 2026, 14:14 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: aws/aws-sdk-php 3.288.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist aws/aws-sdk-php: affected < 3.288.1; fixed in 3.288.1

## Suggested inspection (read-only)
- Packagist aws/aws-sdk-php: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on aws/aws-sdk-php.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-557v-xcg6-rm5m (GitHub-reviewed advisory GHSA-557v-xcg6-rm5m lists affected ranges: Packagist aws/aws-sdk-php >=0 <3.288.1)

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