httpd: NULL pointer dereference crash with ErrorDocument 400 pointing to a local URL-path

A NULL pointer dereference flaw was found in the way httpd generated certain error responses. A remote attacker could possibly use this flaw to crash the httpd child process using a request that triggers a certain HTTP error...

Apache Httpd < 2.4.16 : Crash in ErrorDocument 400 handling

A crash in ErrorDocument handling was found. If ErrorDocument 400 was configured pointing to a local URL-path with the INCLUDES filter active, a NULL dereference would occur when handling the error, causing the child process to crash. This issue affected the 2.4.12 release only...