CVE catalog

CVE-2021-32765

hiredis: CVE-2021-32765

Severity: High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: Oct 4, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.14% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	hiredis	sid	`1.2.0-6`	fixed
Debian	hiredis	forky	`1.2.0-6`	fixed
Debian	hiredis	trixie	`1.2.0-6`	fixed
Debian	hiredis	bookworm	`0.14.1-3`	fixed
Ubuntu	hiredis	16.04	`0.13.1-2`	vulnerable
Ubuntu	hiredis	16.04	`0.13.3-1`	vulnerable
Ubuntu	hiredis	16.04	`0.13.3-2`	vulnerable
Suse	hiredis	package hub 15 sp3	`0.13.3-bp153.2.3.1`	fixed
Opensuse	hiredis	leap 15.2	`0.13.3-bp153.2.3.1`	fixed
Opensuse	hiredis	leap 15.3	`0.13.3-bp153.2.3.1`	fixed
Suse	hiredis	package hub 15 sp2	`0.13.3-bp152.4.3.1`	fixed
Opensuse	hiredis	tumbleweed	`1.0.2-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	hiredis	source	sid	`0.14.1-2`	unimportant	Not reported	Not reported
Debian	hiredis	source	forky	`0.14.1-2`	unimportant	Not reported	Not reported
Debian	hiredis	source	trixie	`0.14.1-2`	unimportant	Not reported	Not reported
Debian	hiredis	source	bookworm	`0.14.1-2`	unimportant	Not reported	Not reported
Suse	hiredis	rpm	package hub 15 sp3	`0.13.3-bp153.2.3.1`	Not reported	OPENSUSE-SU-2021:1536-1	Not reported
Opensuse	hiredis	rpm	leap 15.2	`0.13.3-bp153.2.3.1`	Not reported	OPENSUSE-SU-2021:1536-1	Not reported
Opensuse	hiredis	rpm	leap 15.3	`0.13.3-bp153.2.3.1`	Not reported	OPENSUSE-SU-2021:1536-1	Not reported
Suse	hiredis	rpm	package hub 15 sp2	`0.13.3-bp152.4.3.1`	Not reported	OPENSUSE-SU-2021:1550-1	Not reported
Opensuse	hiredis	rpm	tumbleweed	`1.0.2-1.1`	Not reported	OPENSUSE-SU-2024:11561-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[hiredis-devel]Unknown
Source package: [hiredis]
Details (1)
- 1.3.0-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.0.2-1.1
  Version impact unknown
  dsa · hiredis · opensuse · tumbleweed
[libhiredis1_3_0]Unknown
Source package: [hiredis]
Details (1)
- 1.3.0-1.5 · x86_64 · tumbleweed
  Unknown · Fixed: 1.0.2-1.1
  Version impact unknown
  dsa · hiredis · opensuse · tumbleweed
[hiredis]Fixed
Source package: [hiredis]
Details (1)
- 1.3.0-1.5 · x86_64 · tumbleweed
  Fixed · Fixed: 1.0.2-1.1
  dsa · hiredis · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[libhiredis0.14]Fixed
Source package: [hiredis]
Details (2)
- 0.14.1-3 · amd64 · bookworm
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · bookworm; dsa · hiredis · debian · 12
- 0.14.1-3 · arm64 · bookworm
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · bookworm; dsa · hiredis · debian · 12
[libhiredis-dev]Fixed
Source package: [hiredis]
Details (2)
- 0.14.1-3 · amd64 · bookworm
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · bookworm; dsa · hiredis · debian · 12
- 0.14.1-3 · arm64 · bookworm
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · bookworm; dsa · hiredis · debian · 12

[Debian 13 (Trixie)]

[libhiredis1.1.0]Fixed
Source package: [hiredis]
Details (2)
- 1.2.0-6+b3 · amd64 · trixie
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · 13
- 1.2.0-6+b3 · arm64 · trixie
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · 13
[libhiredis-dev]Fixed
Source package: [hiredis]
Details (2)
- 1.2.0-6+b3 · amd64 · trixie
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · 13
- 1.2.0-6+b3 · arm64 · trixie
  Fixed · Fixed: 0.14.1-2
  dsa · hiredis · debian · 13

Observed: Oct 23, 2026, 5:57:35 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]