A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:4845-1 advisory.

    This update for tiff fixes the following issue:

    - CVE-2026-18495: libtiff: heap-buffer overflow via numeric truncation in the JPEG raw passthrough     (bsc#1280164).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:4252-1 advisory.

    This update for tiff fixes the following issue:

    - CVE-2026-18495: libtiff: heap-buffer overflow via numeric truncation in the JPEG raw passthrough     (bsc#1280164).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to     an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially     crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This     leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash     and severe memory corruption. (CVE-2026-18495)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A vulnerability was found in LibTIFF up to 4.7.0. It has been declared as critical. This vulnerability
    affects the function get_histogram of the file tools/tiffmedian.c. The manipulation leads to use after
    free. The attack needs to be approached locally. The exploit has been disclosed to the public and may be
    used. The patch is identified as fe10872e53efba9cc36c66ac4ab3b41a839d5172. It is recommended to apply a
    patch to fix this issue. (CVE-2025-8176)

  - A vulnerability was found in LibTIFF up to 4.7.0. It has been declared as problematic. Affected by this
    vulnerability is the function t2p_read_tiff_init of the file tools/tiff2pdf.c of the component fax2ps. The
    manipulation leads to null pointer dereference. The attack needs to be approached locally. The complexity
    of an attack is rather high. The exploitation appears to be difficult. The patch is named
    2ebfffb0e8836bfb1cd7d85c059cd285c59761a4. It is recommended to apply a patch to fix this issue.
    (CVE-2024-13978)

  - A vulnerability classified as problematic was found in libtiff 4.6.0. This vulnerability affects the
    function PS_Lvl2page of the file tools/tiff2ps.c of the component tiff2ps. The manipulation leads to null
    pointer dereference. It is possible to launch the attack on the local host. The complexity of an attack is
    rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and
    may be used. The name of the patch is 6ba36f159fd396ad11bf6b7874554197736ecc8b. It is recommended to apply
    a patch to fix this issue. One of the maintainers explains, that "[t]his error only occurs if
    DEFER_STRILE_LOAD (defer-strile-load:BOOL=ON) or TIFFOpen( .. "rD") option is used." (CVE-2025-8534)

  - A weakness has been identified in LibTIFF 4.7.0. This affects the function main of the file tiffcrop.c of
    the component tiffcrop. Executing manipulation can lead to memory corruption. The attack can only be
    executed locally. The exploit has been made available to the public and could be exploited.
    (CVE-2025-8961)

ID	Name	Product	Family	Type	Severity
371083	SUSE SLED15 / SLES15 Security Update : tiff (SUSE-SU-2026:4845-1)	Nessus	SuSE Local Security Checks	Local	medium
347905	SUSE SLES12 Security Update : tiff (SUSE-SU-2026:4252-1)	Nessus	SuSE Local Security Checks	Local	medium
345245	Linux Distros Unpatched Vulnerability : CVE-2026-18495	Nessus	Misc.	Local	medium
435387	Alpine: libtiffxx, multiple tiff packages: security update to 4.7.1-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	medium
435387	Alpine: libtiffxx, multiple tiff packages: security update to 4.7.1-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	medium

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CVE-2026-18495

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