CVE-2023-49288 - fix commit

Hello,
I'm a security engineer at SUSE. I'm looking at the following security 
advisory [0] but I'm not able to identify the correct commit that fix 
the issue CVE-2023-49288 in squid 6.0.1.

I also looked at the report published at [1], the security advisory is 
linked to a "Use-After-Free in Trace Requests" vulnerability [2] but the 
mitigation suggested ("collapsed_forwarding off") for squid before 6.0.1 
doesn't prevent the crash of squid with the poc provided (this makes me 
wondering if the link between the two source are correct or they refer 
to two different bugs) (tried with squid 5.7).

[0] 
https://github.com/squid-cache/squid/security/advisories/GHSA-rj5h-46j6-q2g5
[1] https://megamansec.github.io/Squid-Security-Audit/
[2] https://megamansec.github.io/Squid-Security-Audit/trace-uaf.html

Thanks a lot,
Have a nice day,
Andrea