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Linux Distros Unpatched Vulnerability : CVE-2026-34757

🗓️ 09 Apr 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 2 Views

Unpatched vulnerability CVE-2026-34757 affects Debian libpng1.6; no patch available.

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

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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.

  - LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable
    Network Graphics) raster image files. From 1.0.9 to before 1.6.57, passing a pointer obtained from
    png_get_PLTE, png_get_tRNS, or png_get_hIST back into the corresponding setter on the same
    png_struct/png_info pair causes the setter to read from freed memory and copy its contents into the
    replacement buffer. The setter frees the internal buffer before copying from the caller-supplied pointer,
    which now dangles. The freed region may contain stale data (producing silently corrupted chunk metadata)
    or data from subsequent heap allocations (leaking unrelated heap contents into the chunk struct). This
    vulnerability is fixed in 1.6.57. (CVE-2026-34757)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  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/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-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04");

  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 = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "libpng12-0"},
          {"reference": "libpng12-0-udeb"},
          {"reference": "libpng12-dev"},
          {"reference": "libpng3"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libpng1.6"},
          {"reference": "libpng12-0"},
          {"reference": "libpng12-0-udeb"},
          {"reference": "libpng12-dev"},
          {"reference": "libpng3"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libpng-dev"},
          {"reference": "libpng-tools"},
          {"reference": "libpng16-16"},
          {"reference": "libpng16-16-udeb"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libpng-dev"},
          {"reference": "libpng-tools"},
          {"reference": "libpng16-16"},
          {"reference": "libpng16-16-udeb"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "firefox"},
          {"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"},
          {"reference": "java-25-openjdk"},
          {"reference": "java-25-openjdk-crypto-adapter"},
          {"reference": "java-25-openjdk-crypto-adapter-fastdebug"},
          {"reference": "java-25-openjdk-crypto-adapter-slowdebug"},
          {"reference": "java-25-openjdk-demo"},
          {"reference": "java-25-openjdk-demo-fastdebug"},
          {"reference": "java-25-openjdk-demo-slowdebug"},
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          {"reference": "java-25-openjdk-devel-fastdebug"},
          {"reference": "java-25-openjdk-devel-slowdebug"},
          {"reference": "java-25-openjdk-fastdebug"},
          {"reference": "java-25-openjdk-headless"},
          {"reference": "java-25-openjdk-headless-fastdebug"},
          {"reference": "java-25-openjdk-headless-slowdebug"},
          {"reference": "java-25-openjdk-javadoc"},
          {"reference": "java-25-openjdk-javadoc-zip"},
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          {"reference": "java-25-openjdk-slowdebug"},
          {"reference": "java-25-openjdk-src"},
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          {"reference": "libpng"},
          {"reference": "libpng-devel"},
          {"reference": "thunderbird"}
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  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
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    "constraints": [
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        "pkgs": [
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          {"reference": "mingw64-libpng-static"},
          {"reference": "thunderbird"}
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    "package_manager": "rpm-list",
    "constraints": [
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        "pkgs": [
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          {"reference": "java-1.8.0-openjdk-accessibility-slowdebug"},
          {"reference": "java-1.8.0-openjdk-demo"},
          {"reference": "java-1.8.0-openjdk-demo-fastdebug"},
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          {"reference": "java-1.8.0-openjdk-src-fastdebug"},
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          {"reference": "java-17-openjdk-demo"},
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    "constraints": [
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          {"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-17-openjdk"},
          {"reference": "java-17-openjdk-demo"},
          {"reference": "java-17-openjdk-demo-fastdebug"},
          {"reference": "java-17-openjdk-demo-slowdebug"},
          {"reference": "java-17-openjdk-devel"},
          {"reference": "java-17-openjdk-devel-fastdebug"},
          {"reference": "java-17-openjdk-devel-slowdebug"},
          {"reference": "java-17-openjdk-fastdebug"},
          {"reference": "java-17-openjdk-headless"},
          {"reference": "java-17-openjdk-headless-fastdebug"},
          {"reference": "java-17-openjdk-headless-slowdebug"},
          {"reference": "java-17-openjdk-javadoc"},
          {"reference": "java-17-openjdk-javadoc-zip"},
          {"reference": "java-17-openjdk-jmods"},
          {"reference": "java-17-openjdk-jmods-fastdebug"},
          {"reference": "java-17-openjdk-jmods-slowdebug"},
          {"reference": "java-17-openjdk-slowdebug"},
          {"reference": "java-17-openjdk-src"},
          {"reference": "java-17-openjdk-src-fastdebug"},
          {"reference": "java-17-openjdk-src-slowdebug"},
          {"reference": "java-17-openjdk-static-libs"},
          {"reference": "java-17-openjdk-static-libs-fastdebug"},
          {"reference": "java-17-openjdk-static-libs-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"},
          {"reference": "java-25-openjdk"},
          {"reference": "java-25-openjdk-crypto-adapter"},
          {"reference": "java-25-openjdk-crypto-adapter-fastdebug"},
          {"reference": "java-25-openjdk-crypto-adapter-slowdebug"},
          {"reference": "java-25-openjdk-demo"},
          {"reference": "java-25-openjdk-demo-fastdebug"},
          {"reference": "java-25-openjdk-demo-slowdebug"},
          {"reference": "java-25-openjdk-devel"},
          {"reference": "java-25-openjdk-devel-fastdebug"},
          {"reference": "java-25-openjdk-devel-slowdebug"},
          {"reference": "java-25-openjdk-fastdebug"},
          {"reference": "java-25-openjdk-headless"},
          {"reference": "java-25-openjdk-headless-fastdebug"},
          {"reference": "java-25-openjdk-headless-slowdebug"},
          {"reference": "java-25-openjdk-javadoc"},
          {"reference": "java-25-openjdk-javadoc-zip"},
          {"reference": "java-25-openjdk-jmods"},
          {"reference": "java-25-openjdk-jmods-fastdebug"},
          {"reference": "java-25-openjdk-jmods-slowdebug"},
          {"reference": "java-25-openjdk-slowdebug"},
          {"reference": "java-25-openjdk-src"},
          {"reference": "java-25-openjdk-src-fastdebug"},
          {"reference": "java-25-openjdk-src-slowdebug"},
          {"reference": "java-25-openjdk-static-libs"},
          {"reference": "java-25-openjdk-static-libs-fastdebug"},
          {"reference": "java-25-openjdk-static-libs-slowdebug"},
          {"reference": "libpng"},
          {"reference": "libpng-devel"},
          {"reference": "libpng15"},
          {"reference": "thunderbird"}
        ]
      }
    ]
  }
};

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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19 May 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.4 - 5.1
EPSS0.00006
SSVC
2