Out-of-bounds write in ImageSharp - #VU144573
Published: August 21, 2026
Vulnerability identifier: #VU144573
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds write in CCITT fax TIFF strip decompression via BitWriterUtils.WriteBits/WriteBit/WriteZeroBit when parsing an attacker-supplied fax-compressed strip TIFF image. A remote attacker can send a specially crafted TIFF file to cause a denial of service.
The issue affects strip TIFF images using Compression=2 or Compression=3, and no user interaction is required.
Affected software
ImageSharp
Remediation
Install security update from vendor's website.
ImageSharp - update to 4.1.1