Redis < 8.8.0 RCE via RESTORE Double Free (CVE-2026-66373)

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

include('compat.inc');

if (description)
{
  script_id(331358);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/03");

  script_cve_id("CVE-2026-66373");

  script_name(english:"Redis < 8.8.0 RCE via RESTORE Double Free (CVE-2026-66373)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Redis server is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Redis installed on the remote host is prior to 8.8.0.
It is, therefore, affected by a remote code execution vulnerability.

  - Redis before 8.8.0, in the unusual case where an authenticated
    attacker can execute RESTORE, allows remote code execution via a
    RESTORE payload where the same NACK (pending entry) is referenced
    by more than one consumer, because deleting both consumers via
    XGROUP DELCONSUMER leads to a double free. NOTE: this issue exists
    because of an incomplete fix for CVE-2026-25243.
    (CVE-2026-66373)

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/redis/redis/pull/15081");
  script_set_attribute(attribute:"solution", value:
"Update to Redis 8.8.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:S/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:H/PR:L/UI:N/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:"cvss_score_source", value:"CVE-2026-66373");

  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:"2026/07/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/31");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:redis:redis");
  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("redis_detect.nbin");
  script_require_keys("Settings/ParanoidReport");
  script_require_ports("Services/redis_server", 6379);

  exit(0);
}

include('vcf.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

var port = get_service(svc:"redis_server", default:6379, exit_on_fail:TRUE);
var kb_ver = "redis/" + port + "/Version";

var app_info = vcf::get_app_info(kb_ver:kb_ver, port:port, app:"Redis Server", service:TRUE);

var constraints = [
  { "fixed_version" : "8.8.0" }
];

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