{"id":"CVE-2021-32765","details":"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.","aliases":["GHSA-hfm9-39pp-55p2"],"modified":"2026-05-15T12:03:47.148115549Z","published":"2021-10-04T21:15:12.527Z","related":["openSUSE-SU-2021:1536-1","openSUSE-SU-2021:1550-1","openSUSE-SU-2024:11561-1"],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"last_affected":"9.0"}],"source":"CPE_FIELD","vendor_product":"debian:debian_linux"}]},"references":[{"type":"ADVISORY","url":"https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/10/msg00007.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202210-32"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20211104-0003/"},{"type":"ADVISORY","url":"https://wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap"},{"type":"FIX","url":"https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e"}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}