CVE-2025-9900High· 8.8▾ Twilight

A flaw was found in Libtiff

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 …

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score49/ 100 · Moderate

impact 48.4 · likelihood 0.2 · exploitation 0

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Proof of concept

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Published

Sep 23, 2025

Updated

Jun 25, 2026

CVSS

8.8

Vendor

—

Product

—

CWE

CWE-123

Depth score

49 · Moderate

EPSS

0.79% · p54

Platforms

—

Source

NVD

Vector

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

EPSS history

Exploit-prediction probability, daily snapshots since Jul 4.

0.7% → 0.8%▲ 0.05%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 335 days

Sep 23, 2025Published
Disclosed via NVD
Jun 25, 2026Record revised
Last analysed / modified upstream
Jul 4, 2026EPSS first tracked
0.7%
Aug 24, 2026EPSS peak
0.7% → 0.8%

CWE-123 #nvd

Full technical detail▾

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.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd