Thanks for reporting a potential issue of our project! Just for clarification, Kamailio does not contain code from any other project in this case, I tracked the related code to be dated back to 2002 (when the project had its original name SER and the project you named didn't exist). The other project probably inherited from this one when it was forked.

Anyhow, I tried to reproduce with the sample SIP message from the web and I didn't get any crash with Kamailio git master branch, it prints error messages:

 3(142428) ERROR: {1 9 REGISTER 83ZZolAa} <core> [core/parser/digest/digest.c:323]: find_credentials(): error while parsing credentials
 3(142428) ERROR: {1 9 REGISTER 83ZZolAa} auth [api.c:73]: pre_auth(): Error while looking for credentials
 3(142428) DEBUG: {1 9 REGISTER 83ZZolAa} auth_db [authorize.c:261]: digest_authenticate_hdr(): error or bad credentials

Then sends back SIP 401 response and continues to work normally. Kamailio was started with MySQL backed and user authentication done with auth_db module (like default kamailio.cfg with defined WITH_MYSQL and WITH-AUTH).

Can you provide (here or better via email to miconda@gmail.com) a SIP message related to this issue that causes a crash for Kamailio git master branch?

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