Vim 9.2.0511 < 9.2.0844 Use-After-Free (GHSA-69ch-22ch-r887)

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

include('compat.inc');

if (description)
{
  script_id(335162);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/14");

  script_cve_id("CVE-2026-73071");
  script_xref(name:"IAVA", value:"2026-A-0846");

  script_name(english:"Vim 9.2.0511 < 9.2.0844 Use-After-Free (GHSA-69ch-22ch-r887)");

  script_set_attribute(attribute:"synopsis", value:
"A text editor installed on the remote host is affected by a use-after-free vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Vim installed on the remote host is between 9.2.0511 and 9.2.0844 (exclusive). It is, therefore,
affected by a vulnerability as referenced in the GHSA-69ch-22ch-r887 advisory.

  - From 9.2.0511 until 9.2.0844, json_decode_item() in src/json.c can retain a stale pointer after
    json_decode_string() invokes channel_fill() to refill and free the current buffer, causing the error path to read
    freed memory instead of reader->js_buf + reader->js_used when an invalid JSON string spans buffers.
    (CVE-2026-73071)

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://github.com/vim/vim/security/advisories/GHSA-69ch-22ch-r887");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Vim version 9.2.0844 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-73071");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(416);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/07/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/13");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:vim:vim");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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("vim_win_installed.nbin", "vim_nix_installed.nbin");
  script_require_keys("installed_sw/Vim");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Vim', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints' : [
        { 'min_version' : '9.2.0511', 'fixed_version' : '9.2.0844' }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_NOTE);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);