---
id: CVE-2025-9900
title: A flaw was found in Libtiff
summary: >-
  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
  …
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-123
published: '2025-09-23'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9900'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:17651'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:17675'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:17710'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:17738'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:17739'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:17740'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19113'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19156'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19276'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19906'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:19947'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:20956'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:20998'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21060'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21061'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21062'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21407'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21506'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21507'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21508'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:21994'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23078'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23079'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23080'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0001'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0076'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0077'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:0078'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:3461'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:3462'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:7504'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-9900'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2392784'
    label: secalert@redhat.com
  - url: >-
      https://github.com/SexyShoelessGodofWar/LibTiff-4.7.0-Write-What-Where?tab=readme-ov-file
    label: secalert@redhat.com
  - url: 'https://gitlab.com/libtiff/libtiff/-/issues/704'
    label: secalert@redhat.com
  - url: 'https://gitlab.com/libtiff/libtiff/-/merge_requests/732'
    label: secalert@redhat.com
  - url: 'https://libtiff.gitlab.io/libtiff/releases/v4.7.1.html'
    label: secalert@redhat.com
  - url: 'http://www.openwall.com/lists/oss-security/2025/09/26/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/09/msg00031.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/SexyShoelessGodofWar/LibTiff-4.7.0-Write-What-Where?tab=readme-ov-file
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00792
epssPercentile: 0.54459
ingestedAt: '2026-06-29T13:24:34.572Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.