Red Hat libtiff tiff2pdf buffer overflow

Summaryinfo

A vulnerability described as critical has been identified in Red Hat libtiff. Impacted is an unknown function of the component tiff2pdf. Executing a manipulation can lead to buffer overflow. The identification of this vulnerability is CVE-2026-18495. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Red Hat libtiff (unknown version) and classified as critical. This vulnerability affects an unknown code block of the component tiff2pdf. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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 advisory is shared for download at access.redhat.com. This vulnerability was named CVE-2026-18495 since 07/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Image Processing Software

Vendor

• Red Hat

Name

• libtiff

License

• open-source

Website

• Vendor: https://www.redhat.com/

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