GitHub Enterprise 3.x < 3.14.25 / 3.15.x < 3.15.20 / 3.16.x < 3.16.16 / 3.17.x < 3.17.13 / 3.18.x < 3.18.7 / 3.19.x < 3.19.4 RCE (CVE-2026-3854)

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

include('compat.inc');

if (description)
{
  script_id(311439);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/04");

  script_cve_id("CVE-2026-3854");

  script_name(english:"GitHub Enterprise 3.x < 3.14.25 / 3.15.x < 3.15.20 / 3.16.x < 3.16.16 / 3.17.x < 3.17.13 / 3.18.x < 3.18.7 / 3.19.x < 3.19.4 RCE (CVE-2026-3854)");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of GitHub Enterprise installed on the remote host is affected by a remote code execution vulnerability:

  - An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that
    allowed an attacker with push access to a repository to achieve remote code execution on the instance. During a
    git push operation, user-supplied push option values were not properly sanitized before being included in internal
    service headers. (CVE-2026-3854)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.blog/security/securing-the-git-push-pipeline-responding-to-a-critical-remote-code-execution-vulnerability/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?26b4ba66");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.14.25
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8ae84d71");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.15.20
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?da73ace8");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.16.16
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?df3d0abb");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.17.13
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f07d3feb");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.18.7
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3f3efe21");
  # https://docs.github.com/en/[email protected]/admin/release-notes#3.19.4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?41a683c1");
  script_set_attribute(attribute:"solution", value:
"Upgrade to GitHub Enterprise version 3.14.25 / 3.15.20 / 3.16.16 / 3.17.13 / 3.18.7 / 3.19.4 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-3854");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/01");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:github:github_enterprise");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

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

  script_dependencies("github_enterprise_detect.nbin");
  script_require_keys("installed_sw/GitHub Enterprise");

  exit(0);
}

include('vcf.inc');

var app_info = vcf::combined_get_app_info(app:'GitHub Enterprise');

if (report_paranoia < 2) {
  vcf::check_all_backporting(app_info:app_info);
  vcf::check_granularity(app_info:app_info, sig_segments:3);
}

var constraints = [
  { 'min_version' : '3.0',  'fixed_version' : '3.14.25' },
  { 'min_version' : '3.15', 'fixed_version' : '3.15.20' },
  { 'min_version' : '3.16', 'fixed_version' : '3.16.16' },
  { 'min_version' : '3.17', 'fixed_version' : '3.17.13' },
  { 'min_version' : '3.18', 'fixed_version' : '3.18.7' },
  { 'min_version' : '3.19', 'fixed_version' : '3.19.4' }
];

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);