CVE-2016-5319 in LibTIFF
Summary
by MITRE
Heap-based buffer overflow in tif_packbits.c in libtiff 4.0.6 and earlier allows remote attackers to crash the application via a crafted bmp file.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2016-5319 represents a critical heap-based buffer overflow flaw within the libtiff library version 4.0.6 and earlier. This issue specifically resides in the tif_packbits.c component which handles PackBits compression algorithm processing for TIFF image files. The flaw manifests when the library processes malformed BMP files that trigger improper memory allocation during decompression operations, creating conditions where attacker-controlled data can overwrite adjacent heap memory regions. The vulnerability is particularly dangerous because it allows remote code execution through crafted image files that could be delivered via web browsers, email attachments, or file sharing platforms, making it a significant threat to applications that rely on libtiff for image processing.
The technical implementation of this vulnerability stems from inadequate bounds checking during the decompression of PackBits compressed data streams. When the tif_packbits.c module encounters a malformed BMP file containing crafted PackBits data, it fails to properly validate the length of data segments before copying them into heap-allocated buffers. This improper validation allows attackers to supply data that exceeds the allocated buffer boundaries, resulting in heap corruption that can lead to arbitrary code execution or application crashes. The vulnerability maps to CWE-121 heap-based buffer overflow as defined in the Common Weakness Enumeration catalog, which specifically addresses issues where data is written beyond the boundaries of heap-allocated buffers. The flaw operates at the intersection of memory safety and data validation, making it particularly challenging to detect and exploit in complex software environments.
The operational impact of CVE-2016-5319 extends far beyond simple application crashes, as it enables sophisticated remote exploitation scenarios that can compromise entire systems. Applications using vulnerable versions of libtiff are at risk when processing untrusted image files, including web applications, image viewers, document processing systems, and digital asset management platforms. Attackers can leverage this vulnerability through various attack vectors including web-based exploitation where malicious image files are embedded in web pages, email attachments that trigger automatic image rendering, or file sharing systems where users download and open image files. The exploitability factor is particularly high because many applications automatically process image files without proper sandboxing or input validation, creating multiple attack surfaces. This vulnerability aligns with ATT&CK technique T1203 by enabling remote code execution through malicious file processing, and represents a classic example of how image processing libraries can become attack vectors in modern computing environments.
Mitigation strategies for CVE-2016-5319 focus on immediate patching of libtiff libraries to versions 4.0.7 or later where the buffer overflow has been addressed through proper bounds checking and memory allocation validation. System administrators should prioritize updating all affected applications and libraries that depend on libtiff, particularly those handling untrusted image files from external sources. Network-level defenses can include implementing content filtering for image file types, deploying sandboxing mechanisms for image processing operations, and establishing strict input validation for all file uploads. Additionally, organizations should consider implementing application whitelisting policies that restrict which image processing applications can execute and monitor for unusual memory allocation patterns that might indicate exploitation attempts. The remediation process should also include comprehensive vulnerability scanning to identify all systems using affected libtiff versions and establishing incident response procedures for potential exploitation attempts. Organizations relying on legacy systems may need to implement additional protective measures such as network segmentation, mandatory file format validation, and regular security assessments to maintain operational security while transitioning to patched versions.