high 7.8

CVE-2020-22219 json

Buffer Overflow vulnerability in function `bitwriter_grow_` in flac before 1.4.0 allows remote...

published 2023-08-22 3 y ago modified 2026-07-25 3 mo ago also EUVD-2020-14984 , JLSEC-2026-21

cvss: 7.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits: 0; none known

Buffer Overflow vulnerability in function bitwriter_grow_ in flac before 1.4.0 allows remote attackers to run arbitrary code via crafted input to the encoder.

Patch / fix

fixed in 2 distros 7

julia FLAC_jll 1.4.2+0
flac_project flac 1.4.0

debian ubuntu red hat suse almalinux rocky linux azure linux

flac Debian 14, Debian 13, Debian 12 1.4.1-1

debian advisories DEBIAN-CVE-2020-22219

flac Ubuntu 20.04 LTS 1.3.3-1ubuntu0.2
flac Ubuntu 22.04 LTS 1.3.3-2ubuntu0.2
flac Ubuntu Pro 14.04 LTS 1.3.0-2ubuntu0.14.04.1+esm2
flac Ubuntu Pro 16.04 LTS 1.3.1-4ubuntu0.1~esm2
flac Ubuntu Pro 18.04 LTS 1.3.2-1ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2020-22219

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

flac RHEL 8 1.3.2-9.el8_8.1
flac-libs RHEL 8 1.3.2-9.el8_8.1
flac RHEL 9 1.3.3-10.el9_2.1
flac-libs RHEL 9 1.3.3-10.el9_2.1
flac RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 1.3.2-9.el8_4.1
flac-libs RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 1.3.2-9.el8_4.1
flac RHEL 8.6 EUS 1.3.2-9.el8_6.1
flac-libs RHEL 8.6 EUS 1.3.2-9.el8_6.1

red hat advisories RHSA-2023:5044 RHSA-2023:5046 RHSA-2023:5045 RHSA-2023:5047 RHSA-2023:5048 RHSA-2023:5043

flac SLE Module for Package Hub 15 SP5, SLE Module for Package Hub 15 SP4, SLE Module for Basesystem 15 SP5 +5 more 1.3.2-150000.3.14.1

suse advisories SUSE-SU-2023:3635-1

flac AlmaLinux 8 1.3.2-9.el8_8.1
flac-libs AlmaLinux 8 1.3.2-9.el8_8.1
flac AlmaLinux 9 1.3.3-10.el9_2.1
flac-libs AlmaLinux 9 1.3.3-10.el9_2.1

almalinux advisories ALSA-2023:5046 ALSA-2023:5048

flac Rocky Linux 9 1.3.3-10.el9_2.1

rocky linux advisories RLSA-2023:5048

flac CBL-Mariner 2.0 1.4.3-1

azure linux advisories AZL-28074

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-22219 updated 2026-11-04 cvss 7.8

flac: Remote Code Execution (RCE) via the bitwriter_grow_ function, by supplying crafted input to the encoder

Red Hat Enterprise Linux 6 flac
affected: workaround, no fix planned “Out of support scope”
Red Hat CodeReady Linux Builder EUS (v.8.6) flac 1.3.2-9.el8_6.1
fixed: vendor fix RHSA-2023:5045
Red Hat CodeReady Linux Builder EUS (v.9.0) flac 1.3.3-9.el9_0.1
fixed: vendor fix RHSA-2023:5047
Red Hat Enterprise Linux AppStream (v. 8) flac 1.3.2-9.el8_8.1, flac-libs 1.3.2-9.el8_8.1
fixed: vendor fix RHSA-2023:5046
Red Hat Enterprise Linux AppStream (v. 9) flac 1.3.3-10.el9_2.1, flac-libs 1.3.3-10.el9_2.1
fixed: vendor fix RHSA-2023:5048
Red Hat Enterprise Linux AppStream AUS (v. 8.2) flac 1.3.2-9.el8_2.1, flac-libs 1.3.2-9.el8_2.1
fixed: vendor fix RHSA-2023:5043
Red Hat Enterprise Linux AppStream AUS (v.8.4) flac 1.3.2-9.el8_4.1, flac-libs 1.3.2-9.el8_4.1
fixed: vendor fix RHSA-2023:5044
Red Hat Enterprise Linux AppStream E4S (v. 8.1) flac 1.3.2-9.el8_1.1, flac-libs 1.3.2-9.el8_1.1
fixed: vendor fix RHSA-2023:5042

show 9 more

Red Hat Enterprise Linux AppStream E4S (v. 8.2) flac 1.3.2-9.el8_2.1, flac-libs 1.3.2-9.el8_2.1
fixed: vendor fix RHSA-2023:5043
Red Hat Enterprise Linux AppStream E4S (v.8.4) flac 1.3.2-9.el8_4.1, flac-libs 1.3.2-9.el8_4.1
fixed: vendor fix RHSA-2023:5044
Red Hat Enterprise Linux AppStream EUS (v.8.6) flac 1.3.2-9.el8_6.1, flac-libs 1.3.2-9.el8_6.1
fixed: vendor fix RHSA-2023:5045
Red Hat Enterprise Linux AppStream EUS (v.9.0) flac 1.3.3-9.el9_0.1, flac-libs 1.3.3-9.el9_0.1
fixed: vendor fix RHSA-2023:5047
Red Hat Enterprise Linux AppStream TUS (v. 8.2) flac 1.3.2-9.el8_2.1, flac-libs 1.3.2-9.el8_2.1
fixed: vendor fix RHSA-2023:5043
Red Hat Enterprise Linux AppStream TUS (v.8.4) flac 1.3.2-9.el8_4.1, flac-libs 1.3.2-9.el8_4.1
fixed: vendor fix RHSA-2023:5044
Red Hat Enterprise Linux CRB (v. 8) flac 1.3.2-9.el8_8.1
fixed: vendor fix RHSA-2023:5046
Red Hat Enterprise Linux CRB (v. 9) flac 1.3.3-10.el9_2.1
fixed: vendor fix RHSA-2023:5048
Red Hat Enterprise Linux 7 flac, flac-libs Red Hat OpenShift Container Platform 4 flac, flatpak-sdk-container, flatpak-runtime-container, openshift4/network-tools-rhel8 Red Hat OpenStack Platform 17.0 flac, openstack-nova-libvirt-container Red Hat OpenStack Platform 17.1 flac, flatpak-sdk-container, flatpak-runtime-container, oadp-mustgather-container, mta-windup-addon-container, openstack-nova-libvirt-container Red Hat OpenStack Platform 18.0 flac, flatpak-sdk-container, flatpak-runtime-container, oadp-mustgather-container, mta-windup-addon-container, openstack-nova-libvirt-container
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-03)

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/xiph/flac/issues/215 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	7.8	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
julia	FLAC_jll	<1.4.2+0	1.4.2+0

Classification

Weakness

CWE-120 Buffer Copy without Checking Size of Input

References

github.com /xiph/flac/issues/215
exploit, issue-tracking, web
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/ZD2AJTU4PCJQP7HPTS2L2ELJWBASCRGD/
vendor-advisory, web
debian.org /security/2023/dsa-5500
vendor-advisory, web
lists.debian.org /debian-lts-announce/2023/09/msg00028.html
mailing-list, web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary