# CVE-2021-0561: flac: FLAC stands for Free Lossless Audio Codec CVE-2021-0561 is fixed in 8 products on 1 platform, first by flac 1.3.2-1ubuntu0.1, released June 22, 2021. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2021-0561 - Priority: Routine - CVSS: 5.5 (Moderate) - EPSS: 0.0047 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 22, 2021 ## Description FLAC stands for Free Lossless Audio Codec. FLAC is similar to Ogg Vorbis, but lossless. The FLAC project consists of the stream format, reference encoders and decoders in library form, a command-line program to encode and decode FLAC files, and a command-line metadata editor for FLAC files. Security Fix(es): * flac: out of bound write in append_to_verify_fifo_interleaved_ of stream_encoder.c (CVE-2021-0561) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.1 Release Notes linked from the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | flac RHEL 9 | 0:1.3.3-10.el9 | [RHSA-2022:8078](https://patchblox.com/security/data/fix/linux/rhsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac Ubuntu 18.04.6 LTS (bionic) | 1.3.2-1ubuntu0.1 | [flac 1.3.2-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-flac-1.3.2-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | flac Ubuntu 20.04 LTS (focal) | 1.3.3-1ubuntu0.1 | [flac 1.3.3-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-flac-1.3.3-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | flac Ubuntu 22.04.1 LTS (jammy) | 1.3.3-2ubuntu0.1 | [flac 1.3.3-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-flac-1.3.3-2ubuntu0.1.md) | Jun 22, 2021 | | Linux | flac almalinux 9 | 1.3.3-10.el9 | [ALSA-2022:8078](https://patchblox.com/security/data/fix/linux/alsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | flac ol 9 | 0:1.3.3-10.el9 | [ELSA-2022-8078](https://patchblox.com/security/data/fix/linux/elsa-2022-8078.md) | Nov 22, 2022 | | Linux | flac rocky 9 | 0:1.3.3-10.el9 | [RLSA-2022:8078](https://patchblox.com/security/data/fix/linux/rlsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac-debuginfo amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | flac-debugsource amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | flac-devel RHEL 9 | 0:1.3.3-10.el9 | [RHSA-2022:8078](https://patchblox.com/security/data/fix/linux/rhsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac-devel almalinux 9 | 1.3.3-10.el9 | [ALSA-2022:8078](https://patchblox.com/security/data/fix/linux/alsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac-devel amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | flac-devel ol 9 | 0:1.3.3-10.el9 | [ELSA-2022-8078](https://patchblox.com/security/data/fix/linux/elsa-2022-8078.md) | Nov 22, 2022 | | Linux | flac-libs RHEL 9 | 0:1.3.3-10.el9 | [RHSA-2022:8078](https://patchblox.com/security/data/fix/linux/rhsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac-libs almalinux 9 | 1.3.3-10.el9 | [ALSA-2022:8078](https://patchblox.com/security/data/fix/linux/alsa-2022-8078.md) | Nov 15, 2022 | | Linux | flac-libs amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | flac-libs ol 9 | 0:1.3.3-10.el9 | [ELSA-2022-8078](https://patchblox.com/security/data/fix/linux/elsa-2022-8078.md) | Nov 22, 2022 | | Linux | flac-libs-debuginfo amzn 2023 | 1.3.4-1.amzn2023.0.2 | [ALAS2023-2023-008](https://patchblox.com/security/data/fix/linux/alas2023-2023-008.md) | Feb 17, 2023 | | Linux | libflac++6v5 Ubuntu 18.04.6 LTS (bionic) | 1.3.2-1ubuntu0.1 | [libflac++6v5 1.3.2-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libflac-6v5-1.3.2-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | libflac++6v5 Ubuntu 20.04 LTS (focal) | 1.3.3-1ubuntu0.1 | [libflac++6v5 1.3.3-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libflac-6v5-1.3.3-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | libflac++6v5 Ubuntu 22.04.1 LTS (jammy) | 1.3.3-2ubuntu0.1 | [libflac++6v5 1.3.3-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libflac-6v5-1.3.3-2ubuntu0.1.md) | Jun 22, 2021 | | Linux | libflac8 Ubuntu 18.04.6 LTS (bionic) | 1.3.2-1ubuntu0.1 | [libflac8 1.3.2-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libflac8-1.3.2-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | libflac8 Ubuntu 20.04 LTS (focal) | 1.3.3-1ubuntu0.1 | [libflac8 1.3.3-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libflac8-1.3.3-1ubuntu0.1.md) | Jun 22, 2021 | | Linux | libflac8 Ubuntu 22.04.1 LTS (jammy) | 1.3.3-2ubuntu0.1 | [libflac8 1.3.3-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libflac8-1.3.3-2ubuntu0.1.md) | Jun 22, 2021 | --- Data as of 2026-11-09T01:18:40Z UTC. 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