Integer overflow in LibTIFF - CVE-2026-4775
Published: May 26, 2026
Vulnerability identifier: #VU132310
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-4775
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibTIFF
Affected software:
LibTIFF
LibTIFF
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to signed integer overflow leading to an out-of-bounds write in putcontig8bitYCbCr44tile reachable from TIFFReadRGBAImageOriented when parsing a crafted TIFF image using PHOTOMETRIC_YCBCR with 4,4 subsampling. A remote attacker can supply a specially crafted TIFF file to cause a denial of service.
Exploitation requires the application to process the image through the default bottom-left RGBA orientation flow, and successful triggering depends on attacker-controlled image width and sufficient memory allocation.
How to mitigate CVE-2026-4775
Install security update from vendor's repository.