The amreadpostdata function in modauthmellon before 0.11.1 does not limit the amount of data read, which allows remote attackers to cause a denial of service (worker process crash, web server deadlock, or memory consumption) via a large amount of POST data.
The amreadpostdata function in modauthmellon before 0.11.1 does not check if the apgetclientblock function returns an error, which allows remote attackers to cause a denial of service (segmentation fault and process crash) via a crafted POST data.