CVE-2021-32765 : faille élevée redis hiredis (CVSS 8.8)

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.

Sévérité

Élevée (CVSS 8.8)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation active

Non signalée par la CISA

Publication

4 oct. 2021

Dernière mise à jour

17 juin 2026

• redis hiredis
• debian debian linux
• netapp management services for element software and netapp hci

• Fiche CVE-2021-32765 sur le NVD (NIST)
• github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0…
• github.com/redis/hiredis/security/advisories/GHSA…
• lists.debian.org/debian-lts-announce/2021/10/msg00007.html
• security.gentoo.org/glsa/202210-32
• security.netapp.com/advisory/ntap-20211104-0003/
• wiki.sei.cmu.edu/confluence/display/c/MEM07…