CVE-2021-32765: Debian Linux

High severity, CVSS 8.8. EPSS: 2.1% chance of exploitation in the next 30 days.

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.

Affected products

• Debian Debian Linux: version 9.0 only
• Netapp Management Services For Element Software And Netapp Hci: affected versions not specified
• Redis Hiredis: before 1.0.1 (fixed in 1.0.1)

Published 2021-10-04. Last modified 2026-06-17.