[FD] Asterisk Security Release 20.15.2

[Asterisk Development Team via Fulldisclosure <fulldisclosure@xxxxxxxxxxxx>]

The Asterisk Development Team would like to announce security release  
Asterisk 20.15.2.

The release artifacts are available for immediate download at  
https://github.com/asterisk/asterisk/releases/tag/20.15.2
and
https://downloads.asterisk.org/pub/telephony/asterisk

Repository: https://github.com/asterisk/asterisk
Tag: 20.15.2


## Change Log for Release asterisk-20.15.2

### Links:

 - [Full 
ChangeLog](https://downloads.asterisk.org/pub/telephony/asterisk/releases/ChangeLog-20.15.2.html)
  
 - [GitHub 
Diff](https://github.com/asterisk/asterisk/compare/20.15.1...20.15.2)  
 - 
[Tarball](https://downloads.asterisk.org/pub/telephony/asterisk/asterisk-20.15.2.tar.gz)
  
 - [Downloads](https://downloads.asterisk.org/pub/telephony/asterisk)  

### Summary:

- Commits: 1
- Commit Authors: 1
- Issues Resolved: 0
- Security Advisories Resolved: 1
  - 
[GHSA-64qc-9x89-rx5j](https://github.com/asterisk/asterisk/security/advisories/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

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