{
  "cveId": "CVE-2021-4156",
  "url": "https://patchblox.com/security/cve/CVE-2021-4156",
  "summary": "CVE-2021-4156 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2021-4156, released March 23, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libsndfile: libsndfile is a C library for reading and writing files containing sampled sound, such as AIFF, AU, or WAV",
  "description": "libsndfile is a C library for reading and writing files containing sampled sound, such as AIFF, AU, or WAV. \n\nSecurity Fix(es):\n\n* libsndfile: heap out-of-bounds read in src/flac.c in flac_buffer_copy (CVE-2021-4156)\n\nFor 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.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the Red Hat Enterprise Linux 8.6 Release Notes linked from the References section.",
  "published": "2022-03-23T13:15:00Z",
  "severity": "Moderate",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
  "epss": 0.01754,
  "epssPercentile": 0.78052,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "Debian 11.6 (bullseye)",
      "fixedVersion": "1.0.31-2\u002Bdeb11u2",
      "fix": "DLA-4402-1",
      "url": "https://patchblox.com/security/fix/linux/dla-4402-1",
      "released": "2025-12-11T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.1.0-1",
      "fix": "DEBIAN-CVE-2021-4156",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4156",
      "released": "2022-03-23T20:15:10Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.1.0-1",
      "fix": "DEBIAN-CVE-2021-4156",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4156",
      "released": "2022-03-23T20:15:10Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "Debian 14",
      "fixedVersion": "1.1.0-1",
      "fix": "DEBIAN-CVE-2021-4156",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-4156",
      "released": "2022-03-23T20:15:10Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "RHEL 8",
      "fixedVersion": "0:1.0.28-12.el8",
      "fix": "RHSA-2022:1968",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2022-1968",
      "released": "2022-05-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "almalinux 8",
      "fixedVersion": "1.0.28-12.el8",
      "fix": "ALSA-2022:1968",
      "url": "https://patchblox.com/security/fix/linux/alsa-2022-1968",
      "released": "2022-05-10T08:10:12Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "ol 8",
      "fixedVersion": "0:1.0.28-12.el8",
      "fix": "ELSA-2022-1968",
      "url": "https://patchblox.com/security/fix/linux/elsa-2022-1968",
      "released": "2022-05-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile",
      "release": "rocky 8",
      "fixedVersion": "0:1.0.28-12.el8",
      "fix": "RLSA-2022:1968",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2022-1968",
      "released": "2022-05-10T08:10:12Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-devel",
      "release": "RHEL 8",
      "fixedVersion": "0:1.0.28-12.el8",
      "fix": "RHSA-2022:1968",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2022-1968",
      "released": "2022-05-10T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-devel",
      "release": "almalinux 8",
      "fixedVersion": "1.0.28-12.el8",
      "fix": "ALSA-2022:1968",
      "url": "https://patchblox.com/security/fix/linux/alsa-2022-1968",
      "released": "2022-05-10T08:10:12Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-devel",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-devel",
      "release": "ol 8",
      "fixedVersion": "0:1.0.28-12.el8",
      "fix": "ELSA-2022-1968",
      "url": "https://patchblox.com/security/fix/linux/elsa-2022-1968",
      "released": "2022-05-17T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-utils",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile-utils-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.0.31-6.amzn2023.0.2",
      "fix": "ALAS2023-2023-028",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-028",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.28-4ubuntu0.18.04.2\u002Besm2",
      "fix": "libsndfile1 1.0.28-4ubuntu0.18.04.2\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libsndfile1-1.0.28-4ubuntu0.18.04.2-esm2",
      "released": "2024-10-27T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.0.28-7ubuntu0.3",
      "fix": "libsndfile1 1.0.28-7ubuntu0.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libsndfile1-1.0.28-7ubuntu0.3",
      "released": "2024-10-27T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libsndfile1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.0.31-2ubuntu0.2",
      "fix": "libsndfile1 1.0.31-2ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libsndfile1-1.0.31-2ubuntu0.2",
      "released": "2024-10-27T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "sndfile-programs",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.28-4ubuntu0.18.04.2\u002Besm2",
      "fix": "sndfile-programs 1.0.28-4ubuntu0.18.04.2\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-sndfile-programs-1.0.28-4ubuntu0.18.04.2-esm2",
      "released": "2024-10-27T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "sndfile-programs",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.0.28-7ubuntu0.3",
      "fix": "sndfile-programs 1.0.28-7ubuntu0.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-sndfile-programs-1.0.28-7ubuntu0.3",
      "released": "2024-10-27T15:15:00Z"
    },
    {
      "platform": "linux",
      "product": "sndfile-programs",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.0.31-2ubuntu0.2",
      "fix": "sndfile-programs 1.0.31-2ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-sndfile-programs-1.0.31-2ubuntu0.2",
      "released": "2024-10-27T15:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}