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Linux Distros Unpatched Vulnerability : CVE-2026-26740

🗓️ 18 Mar 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 3 Views

Linux hosts with giflib 5.2.2 are unpatched and vulnerable to remote denial of service CVE-2026-26740.

Related
Refs
Code
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-26740
18 Mar 202600:00
–attackerkb
Tenable Nessus		AlmaLinux 10 : java-25-openjdk (ALSA-2026:9693)
24 Apr 202600:00
–nessus
Tenable Nessus		Fedora 44 : giflib (2026-0be1222520)
30 May 202600:00
–nessus
Tenable Nessus		MiracleLinux 9 : java-25-openjdk-25.0.3.0.9-1.el9.ML.1 (AXSA:2026-562:06)
8 May 202600:00
–nessus
Tenable Nessus		Oracle Linux 10 / 9 : java-25-openjdk (ELSA-2026-9693)
23 Apr 202600:00
–nessus
Tenable Nessus		RHEL 7 / 8 / 9 : Java 11 OpenJDK ELS Security Update (Important) (RHSA-2026:9254)
22 Apr 202600:00
–nessus
Tenable Nessus		RHEL 10 / 9 : java-25-openjdk (RHSA-2026:9693)
22 Apr 202600:00
–nessus
Tenable Nessus		RockyLinux 10 : java-25-openjdk (RLSA-2026:9693)
22 May 202600:00
–nessus
AlpineLinux		CVE-2026-26740
18 Mar 202600:00
–alpinelinux
AlmaLinux		Important: java-25-openjdk security update
22 Apr 202600:00
–almalinux
Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(302946);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/29");

  script_cve_id("CVE-2026-26740");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-26740");

  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.

  - Buffer Overflow vulnerability in giflib v.5.2.2 allows a remote attacker to cause a denial of service via
    the EGifGCBToExtension overwriting an existing Graphic Control Extension block without validating its
    allocated size. (CVE-2026-26740)

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-2026-26740");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-26740");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-26740");
  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:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:L/A:H");
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  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-26740");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/18");

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  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/CentOS Linux-7", "Host/OS/CentOS Linux-8", "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", "Host/OS/Red Hat Enterprise Linux-6", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10", "Host/OS/Ubuntu Linux-26.04");

  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/CentOS/rpm-list")) && 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-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "giflib-dbg"},
          {"reference": "giflib-tools"},
          {"reference": "libgif-dev"},
          {"reference": "libgif7"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "java-21-openjdk"},
          {"reference": "java-21-openjdk-demo"},
          {"reference": "java-21-openjdk-demo-fastdebug"},
          {"reference": "java-21-openjdk-demo-slowdebug"},
          {"reference": "java-21-openjdk-devel"},
          {"reference": "java-21-openjdk-devel-fastdebug"},
          {"reference": "java-21-openjdk-devel-slowdebug"},
          {"reference": "java-21-openjdk-fastdebug"},
          {"reference": "java-21-openjdk-headless"},
          {"reference": "java-21-openjdk-headless-fastdebug"},
          {"reference": "java-21-openjdk-headless-slowdebug"},
          {"reference": "java-21-openjdk-javadoc"},
          {"reference": "java-21-openjdk-javadoc-zip"},
          {"reference": "java-21-openjdk-jmods"},
          {"reference": "java-21-openjdk-jmods-fastdebug"},
          {"reference": "java-21-openjdk-jmods-slowdebug"},
          {"reference": "java-21-openjdk-slowdebug"},
          {"reference": "java-21-openjdk-src"},
          {"reference": "java-21-openjdk-src-fastdebug"},
          {"reference": "java-21-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk-static-libs"},
          {"reference": "java-21-openjdk-static-libs-fastdebug"},
          {"reference": "java-21-openjdk-static-libs-slowdebug"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "giflib-utils"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "giflib-utils"},
          {"reference": "java-1.8.0-openjdk"},
          {"reference": "java-1.8.0-openjdk-accessibility"},
          {"reference": "java-1.8.0-openjdk-accessibility-debug"},
          {"reference": "java-1.8.0-openjdk-debug"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-debug"},
          {"reference": "java-1.8.0-openjdk-devel"},
          {"reference": "java-1.8.0-openjdk-devel-debug"},
          {"reference": "java-1.8.0-openjdk-headless"},
          {"reference": "java-1.8.0-openjdk-headless-debug"},
          {"reference": "java-1.8.0-openjdk-javadoc"},
          {"reference": "java-1.8.0-openjdk-javadoc-debug"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip-debug"},
          {"reference": "java-1.8.0-openjdk-src"},
          {"reference": "java-1.8.0-openjdk-src-debug"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "giflib-utils"},
          {"reference": "java-1.8.0-openjdk"},
          {"reference": "java-1.8.0-openjdk-accessibility"},
          {"reference": "java-1.8.0-openjdk-accessibility-debug"},
          {"reference": "java-1.8.0-openjdk-debug"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-debug"},
          {"reference": "java-1.8.0-openjdk-devel"},
          {"reference": "java-1.8.0-openjdk-devel-debug"},
          {"reference": "java-1.8.0-openjdk-headless"},
          {"reference": "java-1.8.0-openjdk-headless-debug"},
          {"reference": "java-1.8.0-openjdk-javadoc"},
          {"reference": "java-1.8.0-openjdk-javadoc-debug"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip-debug"},
          {"reference": "java-1.8.0-openjdk-src"},
          {"reference": "java-1.8.0-openjdk-src-debug"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "java-1.8.0-openjdk"},
          {"reference": "java-1.8.0-openjdk-accessibility"},
          {"reference": "java-1.8.0-openjdk-accessibility-fastdebug"},
          {"reference": "java-1.8.0-openjdk-accessibility-slowdebug"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-fastdebug"},
          {"reference": "java-1.8.0-openjdk-demo-slowdebug"},
          {"reference": "java-1.8.0-openjdk-devel"},
          {"reference": "java-1.8.0-openjdk-devel-fastdebug"},
          {"reference": "java-1.8.0-openjdk-devel-slowdebug"},
          {"reference": "java-1.8.0-openjdk-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless"},
          {"reference": "java-1.8.0-openjdk-headless-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless-slowdebug"},
          {"reference": "java-1.8.0-openjdk-javadoc"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip"},
          {"reference": "java-1.8.0-openjdk-slowdebug"},
          {"reference": "java-1.8.0-openjdk-src"},
          {"reference": "java-1.8.0-openjdk-src-fastdebug"},
          {"reference": "java-1.8.0-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk"},
          {"reference": "java-21-openjdk-demo"},
          {"reference": "java-21-openjdk-demo-fastdebug"},
          {"reference": "java-21-openjdk-demo-slowdebug"},
          {"reference": "java-21-openjdk-devel"},
          {"reference": "java-21-openjdk-devel-fastdebug"},
          {"reference": "java-21-openjdk-devel-slowdebug"},
          {"reference": "java-21-openjdk-fastdebug"},
          {"reference": "java-21-openjdk-headless"},
          {"reference": "java-21-openjdk-headless-fastdebug"},
          {"reference": "java-21-openjdk-headless-slowdebug"},
          {"reference": "java-21-openjdk-javadoc"},
          {"reference": "java-21-openjdk-javadoc-zip"},
          {"reference": "java-21-openjdk-jmods"},
          {"reference": "java-21-openjdk-jmods-fastdebug"},
          {"reference": "java-21-openjdk-jmods-slowdebug"},
          {"reference": "java-21-openjdk-slowdebug"},
          {"reference": "java-21-openjdk-src"},
          {"reference": "java-21-openjdk-src-fastdebug"},
          {"reference": "java-21-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk-static-libs"},
          {"reference": "java-21-openjdk-static-libs-fastdebug"},
          {"reference": "java-21-openjdk-static-libs-slowdebug"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "java-1.8.0-openjdk"},
          {"reference": "java-1.8.0-openjdk-accessibility"},
          {"reference": "java-1.8.0-openjdk-accessibility-fastdebug"},
          {"reference": "java-1.8.0-openjdk-accessibility-slowdebug"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-fastdebug"},
          {"reference": "java-1.8.0-openjdk-demo-slowdebug"},
          {"reference": "java-1.8.0-openjdk-devel"},
          {"reference": "java-1.8.0-openjdk-devel-fastdebug"},
          {"reference": "java-1.8.0-openjdk-devel-slowdebug"},
          {"reference": "java-1.8.0-openjdk-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless"},
          {"reference": "java-1.8.0-openjdk-headless-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless-slowdebug"},
          {"reference": "java-1.8.0-openjdk-javadoc"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip"},
          {"reference": "java-1.8.0-openjdk-slowdebug"},
          {"reference": "java-1.8.0-openjdk-src"},
          {"reference": "java-1.8.0-openjdk-src-fastdebug"},
          {"reference": "java-1.8.0-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk"},
          {"reference": "java-21-openjdk-demo"},
          {"reference": "java-21-openjdk-demo-fastdebug"},
          {"reference": "java-21-openjdk-demo-slowdebug"},
          {"reference": "java-21-openjdk-devel"},
          {"reference": "java-21-openjdk-devel-fastdebug"},
          {"reference": "java-21-openjdk-devel-slowdebug"},
          {"reference": "java-21-openjdk-fastdebug"},
          {"reference": "java-21-openjdk-headless"},
          {"reference": "java-21-openjdk-headless-fastdebug"},
          {"reference": "java-21-openjdk-headless-slowdebug"},
          {"reference": "java-21-openjdk-javadoc"},
          {"reference": "java-21-openjdk-javadoc-zip"},
          {"reference": "java-21-openjdk-jmods"},
          {"reference": "java-21-openjdk-jmods-fastdebug"},
          {"reference": "java-21-openjdk-jmods-slowdebug"},
          {"reference": "java-21-openjdk-slowdebug"},
          {"reference": "java-21-openjdk-src"},
          {"reference": "java-21-openjdk-src-fastdebug"},
          {"reference": "java-21-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk-static-libs"},
          {"reference": "java-21-openjdk-static-libs-fastdebug"},
          {"reference": "java-21-openjdk-static-libs-slowdebug"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "giflib"},
          {"reference": "giflib-devel"},
          {"reference": "java-1.8.0-openjdk"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-fastdebug"},
          {"reference": "java-1.8.0-openjdk-demo-slowdebug"},
          {"reference": "java-1.8.0-openjdk-devel"},
          {"reference": "java-1.8.0-openjdk-devel-fastdebug"},
          {"reference": "java-1.8.0-openjdk-devel-slowdebug"},
          {"reference": "java-1.8.0-openjdk-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless"},
          {"reference": "java-1.8.0-openjdk-headless-fastdebug"},
          {"reference": "java-1.8.0-openjdk-headless-slowdebug"},
          {"reference": "java-1.8.0-openjdk-javadoc"},
          {"reference": "java-1.8.0-openjdk-javadoc-zip"},
          {"reference": "java-1.8.0-openjdk-slowdebug"},
          {"reference": "java-1.8.0-openjdk-src"},
          {"reference": "java-1.8.0-openjdk-src-fastdebug"},
          {"reference": "java-1.8.0-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk"},
          {"reference": "java-21-openjdk-demo"},
          {"reference": "java-21-openjdk-demo-fastdebug"},
          {"reference": "java-21-openjdk-demo-slowdebug"},
          {"reference": "java-21-openjdk-devel"},
          {"reference": "java-21-openjdk-devel-fastdebug"},
          {"reference": "java-21-openjdk-devel-slowdebug"},
          {"reference": "java-21-openjdk-fastdebug"},
          {"reference": "java-21-openjdk-headless"},
          {"reference": "java-21-openjdk-headless-fastdebug"},
          {"reference": "java-21-openjdk-headless-slowdebug"},
          {"reference": "java-21-openjdk-javadoc"},
          {"reference": "java-21-openjdk-javadoc-zip"},
          {"reference": "java-21-openjdk-jmods"},
          {"reference": "java-21-openjdk-jmods-fastdebug"},
          {"reference": "java-21-openjdk-jmods-slowdebug"},
          {"reference": "java-21-openjdk-slowdebug"},
          {"reference": "java-21-openjdk-src"},
          {"reference": "java-21-openjdk-src-fastdebug"},
          {"reference": "java-21-openjdk-src-slowdebug"},
          {"reference": "java-21-openjdk-static-libs"},
          {"reference": "java-21-openjdk-static-libs-fastdebug"},
          {"reference": "java-21-openjdk-static-libs-slowdebug"}
        ]
      }
    ]
  }
};

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

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

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29 May 2026 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.18.2
EPSS0.00215
SSVC
linux vulnerabilitiesgiflib vulnerabilitycve 2026 26740unpatched systemsremote denial service
3