Junglewise Threat Intelligence

CVE-2026-4775: libtiff signed integer overflow in putcontig8bitYCbCr44tile

CVE-2026-4775 · Severity: high · CVSS 7.8 · Published 2026-03-24

Technologies: Debian Linux, Libtiff, Red Hat Enterprise Linux. Vendors: Debian, Libtiff, Red Hat.

Executive brief

A vulnerability has been identified in libtiff, a widely used library for processing TIFF image files. An attacker could exploit this flaw by tricking a user into opening a specially crafted image file, potentially leading to a complete system takeover or a service crash. This impact is significant for any application or server that automatically processes user-uploaded images.

Technical details

A signed integer overflow vulnerability exists in the putcontig8bitYCbCr44tile function within libtiff. The flaw is triggered during the processing of specially crafted TIFF files, leading to incorrect memory pointer calculations. This results in an out-of-bounds (OOB) heap write. An attacker can leverage this to achieve arbitrary code execution or cause a denial of service (application crash). The attack requires a user to open a malicious file (User Interaction: Required). Patches have been released by Red Hat and Debian for various enterprise distributions.

Affected products

  • libtiff libtiff 4.4.0, 4.6.0
  • Red Hat Enterprise Linux 6.0, 7.0, 8.0, 9.0, 10.0
  • Debian Debian Linux 11.0

Timeline

  • 2026-03-24: disclosed: Initial disclosure of CVE-2026-4775
  • 2026-03-24: advisory: NVD publication date
  • 2026-04-30: patched: Red Hat released security updates for RHEL 9 and 10

References

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