A crafted request uri-path can cause modproxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
apachemodphp. Multiple issues were addressed by updating to PHP version 7.3.11.
Description: Due to chunked decoder lenience Squid is vulnerable to Request/Response smuggling attacks when parsing HTTP/1.1 and ICAP messages
Reference: https://github.com/squid-cache/squid/security/advisories/GHSA-j83v-w3p4-5cqh
Affected versions: 2.6-6.3. Patched in 6.4.