ChangeLog for asterisk-21.10.2

## Change Log for Release asterisk-21.10.2

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### Summary:

- Commits: 1
- Commit Authors: 1
- Issues Resolved: 0
- Security Advisories Resolved: 1
- GHSA-64qc-9x89-rx5j: A specifically malformed Authorization header in an incoming SIP request can cause Asterisk to crash

### User Notes:

### Upgrade Notes:

### Developer Notes:

### Commit Authors:

- George Joseph: (1)

## Issue and Commit Detail:

### Closed Issues:

- !GHSA-64qc-9x89-rx5j: A specifically malformed Authorization header in an incoming SIP request can cause Asterisk to crash

### Commits By Author:

- #### George Joseph (1):

- res_pjsip_authenticator_digest: Fix SEGV if get_authorization_hdr returns NULL.

### Commit List:

- res_pjsip_authenticator_digest: Fix SEGV if get_authorization_hdr returns NULL.

### Commit Details:

#### res_pjsip_authenticator_digest: Fix SEGV if get_authorization_hdr returns NULL.

Author: George Joseph Date: 2025-08-28

In the highly-unlikely event that get_authorization_hdr() couldn't find an Authorization header in a request, trying to get the digest algorithm would cauase a SEGV. We now check that we have an auth header that matches the realm before trying to get the algorithm from it.

Resolves: #GHSA-64qc-9x89-rx5j