SB2026052650 - Integer overflow in LibTIFF

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-4775)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://gitlab.com/libtiff/libtiff/-/work_items/787
• https://gitlab.com/libtiff/libtiff/-/commit/782a11d6b5b61c6dc21e714950a4af5bf89f023c