CVE-2026-107651 in Eye of GNOME
Summary
by MITRE • 10/09/2026
A flaw was found in Eye of GNOME (eog). A heap-based buffer overflow exists in the PNG metadata reader due to improper state handling when parsing split metadata chunks. A remote attacker could exploit this flaw by enticing a user into opening a specially crafted PNG file, potentially leading to arbitrary code execution or a Denial of Service (DoS) via application crash.
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Analysis
by VulDB Data Team • 10/09/2026
The vulnerability identified in Eye of GNOME, commonly referred to as eog, represents a critical security risk stemming from improper memory management within the image processing library's handling of Portable Network Graphics metadata. Specifically, this flaw is classified as a heap-based buffer overflow located in the PNG metadata reader component. The root cause lies in the application's failure to correctly manage state when parsing split metadata chunks. In standard PNG file structures, metadata can be divided into multiple smaller chunks rather than contained within a single block. When eog processes these fragmented data segments, it fails to validate or adjust its internal buffer pointers and length counters appropriately for each subsequent chunk. This lack of rigorous boundary checking allows an attacker to craft a maliciously constructed PNG file where the cumulative size of metadata fields exceeds the allocated heap memory space. As the application attempts to write this oversized data into the pre-allocated buffer, it overwrites adjacent memory regions on the heap, leading to unpredictable behavior and potential exploitation.
From a technical perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) identifiers such as CWE-120 Buffer Copy without Checking Size of Input Classic and CWE-787 Out-of-bounds Write. The improper state handling indicates that the software does not maintain accurate tracking of how much data has been consumed or written across multiple parsing iterations. This is particularly dangerous because heap overflows can corrupt internal data structures, such as function return addresses or pointer tables, which are often targeted by attackers to gain control over program execution flow. Unlike stack-based overflows, heap corruption can be more difficult to detect and debug, making it a persistent threat vector for sophisticated adversaries who understand memory layout techniques like those described in the MITRE ATT&CK framework under Tactic TA0004: Privilege Escalation or TA0002: Execution.
The operational impact of this vulnerability is severe due to its potential for remote code execution and denial of service. An attacker can exploit this flaw by distributing a specially crafted PNG file through various vectors, such as email attachments, web pages with auto-loading images, or shared network drives. When an unsuspecting user opens the malicious image using Eye of GNOME, the application processes the malformed metadata chunks, triggering the buffer overflow. Depending on the specific memory layout and operating system protections in place at the time of exploitation, this could allow a remote attacker to execute arbitrary code with the privileges of the current user. This effectively compromises the confidentiality, integrity, and availability of the user's data and systems. Alternatively, if precise control over execution flow is not achievable due to modern mitigations like Address Space Layout Randomization (ASLR) or Data Execution Prevention (DEP), the overflow may simply cause a segmentation fault, resulting in an application crash that denies service to legitimate users attempting to view images.
Mitigation strategies for this vulnerability primarily involve updating the Eye of GNOME software and its underlying dependencies, such as libpng, to versions where the metadata parsing logic has been hardened against split chunk anomalies. Security patches typically address these issues by implementing strict length validation before memory allocation or copy operations and ensuring that state variables are correctly reset or updated after processing each metadata chunk. Users should be advised to avoid opening image files from untrusted sources until updates are applied. Furthermore, organizations can employ application whitelisting or sandboxing techniques to limit the potential impact if a user inadvertently opens a malicious file. Continuous monitoring for anomalous process behavior and ensuring that all software components within the GNOME desktop environment remain up-to-date is essential to maintaining system integrity against this class of memory corruption attacks.