CVE-2025-9900 HIGH

CVE-2025-9900: Libtiff: libtiff write-what-where

Vendor Red Hat
Product Red Hat Enterprise Linux 6
Weakness CWE-123
Published September 23, 2025
Last update April 29, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

A flaw was found in Libtiff. This vulnerability is a "write-what-where" condition, triggered when the library processes a specially crafted TIFF image file. By providing an abnormally large image height value in the file's metadata, an attacker can trick the library into writing attacker-controlled color data to an arbitrary memory location. This memory corruption can be exploited to cause a denial of service (application crash) or to achieve arbitrary code execution with the permissions of the user.

Key dates

02Disclosure timeline

September 23, 2025 CVE published
April 29, 2026 Record updated