Red Hat Enterprise Linux file-fits plugin integer overflow

Summaryinfo

A vulnerability was found in Red Hat Enterprise Linux. It has been classified as very critical. Affected by this issue is some unknown functionality of the component file-fits plugin. The manipulation leads to integer overflow. This vulnerability is traded as CVE-2026-66758. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux (unknown version) and classified as very critical. This issue affects an unknown code block of the component file-fits plugin. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the file-fits plugin in GIMP. When processing a FITS image file, the plugin calculates memory allocation sizes using signed 32-bit integers for width and height. If a crafted file sets both values to large values, their product exceeds 2^31 and overflows, resulting in an undersized heap-based buffer allocation. This integer overflow issue results in a heap-based buffer overflow when cfitsio subsequently writes a full row of pixels in the buffer, causing memory corruption, potentially leading to arbitrary code execution or a denial of service.

The advisory is shared at access.redhat.com. The identification of this vulnerability is CVE-2026-66758 since 07/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/27/2026).

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

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

License

• commercial

Website

• Vendor: https://www.redhat.com/

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