FFmpeg < 8.1.2 Out-of-Bounds Write (CVE-2026-8461)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(321914);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/23");

  script_cve_id("CVE-2026-8461");

  script_name(english:"FFmpeg < 8.1.2 Out-of-Bounds Write (CVE-2026-8461)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by an out-of-bounds write vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of FFmpeg installed on the remote host is prior to 8.1.2. It is, therefore, affected by an out-of-bounds
write vulnerability:

  - An out-of-bounds write vulnerability in FFmpeg's libavcodec library, specifically in the MagicYUV decoder, allows
    denial-of-service and, in some cases, can be exploited for remote code execution. (CVE-2026-8461)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported
version number.");
  script_set_attribute(attribute:"see_also", value:"https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23159");
  script_set_attribute(attribute:"see_also", value:"https://ffmpeg.org/security.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to FFmpeg version 8.1.2 or later.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-8461");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ffmpeg:ffmpeg");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ffmpeg_nix_installed.nbin");
  script_require_keys("installed_sw/FFmpeg");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'linux'}}
  ],
  'checks': [
    {
      'product': {'name': 'FFmpeg', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
        {'fixed_version': '8.1.2'}
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE, check_backporting:TRUE);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);