CVE catalog

CVE-2021-24031

libzstd: CVE-2021-24031

Severity: Medium · CVSS 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: Feb 10, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.46% · Oct 25, 2026

In the Zstandard command-line utility prior to v1.4.1, output files were created with default permissions. Correct file permissions (matching the input) would only be set at completion time. Output files could therefore be readable or writable to unintended parties.

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	libzstd	sid	`1.5.7+dfsg-4`	fixed
Debian	libzstd	forky	`1.5.7+dfsg-4`	fixed
Debian	libzstd	trixie	`1.5.7+dfsg-1`	fixed
Debian	libzstd	bookworm	`1.5.4+dfsg2-5`	fixed
Alpine	zstd	3.14	`1.4.1-r0`	fixed
Alpine	zstd	3.15	`1.4.1-r0`	fixed
Alpine	zstd	3.16	`1.4.1-r0`	fixed
Alpine	zstd	3.17	`1.4.1-r0`	fixed
Alpine	zstd	3.18	`1.4.1-r0`	fixed
Alpine	zstd	3.19	`1.4.1-r0`	fixed
Alpine	zstd	3.20	`1.4.1-r0`	fixed
Alpine	zstd	3.21	`1.4.1-r0`	fixed
Alpine	zstd	3.22	`1.4.1-r0`	fixed
Alpine	zstd	3.23	`1.4.1-r0`	fixed
Alpine	zstd	3.24	`1.4.1-r0`	fixed
Ubuntu	libzstd	pro	`0.4.5-1`	vulnerable
Ubuntu	libzstd	pro	`0.5.1-1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm2`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm3`	fixed
Ubuntu	libzstd	pro	`0.4.5-1`	vulnerable
Ubuntu	libzstd	pro	`0.5.1-1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm1`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm2`	vulnerable
Ubuntu	libzstd	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm3`	fixed
Ubuntu	libzstd	18.04	`1.3.1+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.2+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.2+dfsg2-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-1ubuntu1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1.1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1.2`	fixed
Ubuntu	libzstd	20.04	`1.4.3+dfsg-1`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-1`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-3`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-3ubuntu0.1`	fixed
Ubuntu	libzstd	18.04	`1.3.1+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.2+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.2+dfsg2-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-1ubuntu1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1.1`	vulnerable
Ubuntu	libzstd	18.04	`1.3.3+dfsg-2ubuntu1.2`	fixed
Ubuntu	libzstd	20.04	`1.4.3+dfsg-1`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-1`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-3`	vulnerable
Ubuntu	libzstd	20.04	`1.4.4+dfsg-3ubuntu0.1`	fixed
Suse	zstd	linux enterprise module for basesystem 15 sp2	`1.4.4-1.6.1`	fixed
Suse	zstd	linux enterprise micro 5.0	`1.4.4-1.6.1`	fixed
Opensuse	zstd	leap 15.2	`1.4.4-lp152.2.3.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libzstd	source	sid	`1.4.8+dfsg-1`	not yet assigned	Not reported	[981404]
Debian	libzstd	source	forky	`1.4.8+dfsg-1`	not yet assigned	Not reported	[981404]
Debian	libzstd	source	trixie	`1.4.8+dfsg-1`	not yet assigned	Not reported	[981404]
Debian	libzstd	source	bookworm	`1.4.8+dfsg-1`	not yet assigned	Not reported	[981404]
Alpine	zstd	apk	3.14	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.15	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.16	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.17	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.18	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.19	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.20	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.21	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.22	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.23	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Alpine	zstd	apk	3.24	`1.4.1-r0`	Not reported	ALPINE-CVE-2021-24031	Not reported
Ubuntu	libzstd	deb	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm3`	Not reported	USN-5720-1	Not reported
Ubuntu	libzstd	deb	pro	`1.3.1+dfsg-1~ubuntu0.16.04.1+esm3`	Not reported	UBUNTU-CVE-2021-24031	Not reported
Ubuntu	libzstd	deb	18.04	`1.3.3+dfsg-2ubuntu1.2`	Not reported	UBUNTU-CVE-2021-24031	Not reported
Ubuntu	libzstd	deb	20.04	`1.4.4+dfsg-3ubuntu0.1`	Not reported	UBUNTU-CVE-2021-24031	Not reported
Ubuntu	libzstd	deb	18.04	`1.3.3+dfsg-2ubuntu1.2`	Not reported	USN-4760-1	Not reported
Ubuntu	libzstd	deb	20.04	`1.4.4+dfsg-3ubuntu0.1`	Not reported	USN-4760-1	Not reported
Suse	zstd	rpm	linux enterprise module for basesystem 15 sp2	`1.4.4-1.6.1`	Not reported	SUSE-SU-2021:0948-1	Not reported
Suse	zstd	rpm	linux enterprise micro 5.0	`1.4.4-1.6.1`	Not reported	SUSE-SU-2021:0948-1	Not reported
Opensuse	zstd	rpm	leap 15.2	`1.4.4-lp152.2.3.1`	Not reported	OPENSUSE-SU-2021:0481-1	Not reported

[Debian bug #981404]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libzstd1]Fixed
Source package: [libzstd]
Details (2)
- 1.5.4+dfsg2-5 · amd64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12
- 1.5.4+dfsg2-5 · arm64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12
[libzstd-dev]Fixed
Source package: [libzstd]
Details (2)
- 1.5.4+dfsg2-5 · amd64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12
- 1.5.4+dfsg2-5 · arm64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12
[zstd]Fixed
Source package: [libzstd]
Details (2)
- 1.5.4+dfsg2-5 · amd64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12
- 1.5.4+dfsg2-5 · arm64 · bookworm
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · bookworm; dsa · libzstd · debian · 12

[Debian 13 (Trixie)]

[libzstd1]Fixed
Source package: [libzstd]
Details (2)
- 1.5.7+dfsg-1 · amd64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13
- 1.5.7+dfsg-1 · arm64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13
[libzstd-dev]Fixed
Source package: [libzstd]
Details (2)
- 1.5.7+dfsg-1 · amd64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13
- 1.5.7+dfsg-1 · arm64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13
[zstd]Fixed
Source package: [libzstd]
Details (2)
- 1.5.7+dfsg-1 · amd64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13
- 1.5.7+dfsg-1 · arm64 · trixie
  Fixed · Fixed: 1.4.8+dfsg-1
  dsa · libzstd · debian · 13

Observed: Oct 23, 2026, 5:55:05 PM UTC

References

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