CVE-2021-32765

Date: October 3, 2021

Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted "RESP" "mult-bulk" protocol data. When parsing "multi-bulk" (array-like) replies, hiredis fails to check if "count * sizeof(redisReply*)" can be represented in "SIZE_MAX". If it can not, and the "calloc()" call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the "maxelements" (https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.

Language: C