Linux Distros Unpatched Vulnerability : CVE-2026-77680

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

include('compat.inc');

if (description)
{
  script_id(339667);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/26");

  script_cve_id("CVE-2026-77680");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-77680");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the
    CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range
    many times in a single Range header. Commit 9bb92f7a corrected merge correctness in
    soup_message_headers_get_ranges_internal() in libsoup/soup-message-headers.c, but the coalescing loop
    still removes merged ranges using g_array_remove_index() for each coalesced element. Because GArray is
    contiguous, each mid-array removal performs an O(N) memmove. When many identical satisfiable ranges are
    supplied (for example bytes=0-0 repeated thousands of times), the loop performs O(N) work coalescing them
    into a single range. The vulnerable path is reachable server-side from handle_partial_get() in
    libsoup/server/http1/soup-server-message-io-http1.c when a SoupServer handler returns HTTP 200 with a non-
    empty body. No authentication is required. The number of ranges is bounded only by the maximum request
    header size (~100 KiB), allowing roughly 25,000 ranges per request. Reporter measurements on libsoup HEAD
    containing the CVE-2025-32907 fix show ~90 ms single-core CPU per such request at the wire maximum,
    blocking the server's event loop for that duration. This is a CPU exhaustion / availability issue only. No
    memory corruption or information disclosure occurs. Affected: libsoup versions containing the
    CVE-2025-32907 fix but not merge request !550. Fixed upstream: MR !550 merged 2026-08-20, replacing per-
    element removal with O(N) in-place compaction and rejecting Range headers requesting more than 200 ranges.
    Upstream report: https://gitlab.gnome.org/GNOME/libsoup/-/issues/538 Related: CVE-2025-32907
    (CVE-2026-77680)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-77680");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-77680");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-77680");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsoup2.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libsoup3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsoup3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsoup3-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsoup3-doc");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  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("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Debian Linux-11", "Host/OS/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "Host/OS/Red Hat Enterprise Linux-10");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "gir1.2-soup-2.4"},
          {"reference": "gir1.2-soup-3.0"},
          {"reference": "libsoup-3.0-0"},
          {"reference": "libsoup-3.0-common"},
          {"reference": "libsoup-3.0-dev"},
          {"reference": "libsoup-3.0-doc"},
          {"reference": "libsoup-3.0-tests"},
          {"reference": "libsoup-gnome2.4-1"},
          {"reference": "libsoup-gnome2.4-dev"},
          {"reference": "libsoup2.4-1"},
          {"reference": "libsoup2.4-common"},
          {"reference": "libsoup2.4-dev"},
          {"reference": "libsoup2.4-doc"},
          {"reference": "libsoup2.4-tests"}
        ]
      }
    ]
  },
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "gir1.2-soup-2.4"},
          {"reference": "libsoup-gnome2.4-1"},
          {"reference": "libsoup-gnome2.4-dev"},
          {"reference": "libsoup2.4-1"},
          {"reference": "libsoup2.4-dev"},
          {"reference": "libsoup2.4-doc"},
          {"reference": "libsoup2.4-tests"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "gir1.2-soup-2.4"},
          {"reference": "gir1.2-soup-3.0"},
          {"reference": "libsoup-2.4-1"},
          {"reference": "libsoup-3.0-0"},
          {"reference": "libsoup-3.0-common"},
          {"reference": "libsoup-3.0-dev"},
          {"reference": "libsoup-3.0-doc"},
          {"reference": "libsoup-3.0-tests"},
          {"reference": "libsoup-gnome-2.4-1"},
          {"reference": "libsoup-gnome2.4-dev"},
          {"reference": "libsoup2.4-common"},
          {"reference": "libsoup2.4-dev"},
          {"reference": "libsoup2.4-doc"},
          {"reference": "libsoup2.4-tests"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "gir1.2-soup-3.0"},
          {"reference": "libsoup-3.0-0"},
          {"reference": "libsoup-3.0-common"},
          {"reference": "libsoup-3.0-dev"},
          {"reference": "libsoup-3.0-doc"},
          {"reference": "libsoup-3.0-tests"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "libsoup3"},
          {"reference": "libsoup3-devel"},
          {"reference": "libsoup3-doc"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}