Pull Request resolves # .

• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

This pull request (PR) updates the composer dependency "phpseclib/phpseclib" from version 3.0.50 to version 3.0.51 to fix one low severity security vulnerability reported by composer audit.

Release notes: https://github.com/phpseclib/phpseclib/releases/tag/3.0.51

Testing Instructions

1. Run composer install and then composer audit.
2. Verify that there are no breaking changes done with this update by checking the release information listed above in the summary of changes.

Actual result BEFORE applying this Pull Request

1. Composer audit

Found 2 security vulnerability advisories affecting 2 packages:
+-------------------+----------------------------------------------------------------------------------+
| Package           | phpseclib/phpseclib                                                              |
| Severity          | low                                                                              |
| Advisory ID       | PKSA-zh4j-by9m-7mz8                                                              |
| CVE               | CVE-2026-40194                                                                   |
| Title             | phpseclib has a variable-time HMAC comparison in SSH2::get_binary_packet() using |
|                   | != instead of hash_equals()                                                      |
| URL               | https://github.com/advisories/GHSA-r854-jrxh-36qx                                |
| Affected versions | >=3.0.0,<3.0.51|>=2.0.0,<2.0.53|<1.0.28                                          |
| Reported at       | 2026-04-10T20:58:10+00:00                                                        |
+-------------------+----------------------------------------------------------------------------------+
+-------------------+----------------------------------------------------------------------------------+
| Package           | web-auth/webauthn-lib                                                            |
| Severity          | medium                                                                           |
| Advisory ID       | PKSA-3mms-4n3p-ym65                                                              |
| CVE               | CVE-2024-39912                                                                   |
| Title             | The FIDO2/Webauthn Support for PHP library allows enumeration of valid usernames  |
| URL               | https://github.com/advisories/GHSA-875x-g8p7-5w27                                |
| Affected versions | >=4.5.0,<4.9.0                                                                   |
| Reported at       | 2024-07-15T16:37:49+00:00                                                        |
+-------------------+----------------------------------------------------------------------------------+
Found 1 abandoned package:
+---------------------------+----------------------------------------------------------------------------------+
| Abandoned Package         | Suggested Replacement                                                            |
+---------------------------+----------------------------------------------------------------------------------+
| web-auth/metadata-service | web-auth/webauthn-lib                                                            |
+---------------------------+----------------------------------------------------------------------------------+

2. Not applicable.

Expected result AFTER applying this Pull Request

1. Composer audit

Found 1 security vulnerability advisory affecting 1 package:
+-------------------+----------------------------------------------------------------------------------+
| Package           | web-auth/webauthn-lib                                                            |
| Severity          | medium                                                                           |
| Advisory ID       | PKSA-3mms-4n3p-ym65                                                              |
| CVE               | CVE-2024-39912                                                                   |
| Title             | The FIDO2/Webauthn Support for PHP library allows enumeration of valid usernames  |
| URL               | https://github.com/advisories/GHSA-875x-g8p7-5w27                                |
| Affected versions | >=4.5.0,<4.9.0                                                                   |
| Reported at       | 2024-07-15T16:37:49+00:00                                                        |
+-------------------+----------------------------------------------------------------------------------+
Found 1 abandoned package:
+---------------------------+----------------------------------------------------------------------------------+
| Abandoned Package         | Suggested Replacement                                                            |
+---------------------------+----------------------------------------------------------------------------------+
| web-auth/metadata-service | web-auth/webauthn-lib                                                            |
+---------------------------+----------------------------------------------------------------------------------+

2. No breaking changes.

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed