CVE-2026-109260 in ImageMagick
Summary
by MITRE • 10/12/2026
ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 contains a memory leak in the PNG encoder, which does not release allocated memory when libpng initialization fails. Attackers who can repeatedly trigger PNG encoding operations in which libpng initialization fails can exhaust memory and cause a denial of service.
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability identified in ImageMagick versions prior to 6.9.13-57 for the legacy branch and before 7.1.2-32 for the modern branch represents a significant resource management flaw within the PNG image encoding subsystem. This issue is classified under CWE-401, which describes a missing release of memory after effective usage or failure to free allocated resources. The root cause lies in the error handling logic during the initialization phase of libpng, the underlying library responsible for processing Portable Network Graphics data. When ImageMagick invokes libpng functions to encode an image into PNG format, it allocates various internal structures and buffers required for the encoding process. Under normal circumstances, these resources are properly deallocated upon successful completion or standard termination of the operation. However, a specific code path exists where if libpng initialization fails due to invalid input data or unsupported features, the application does not execute the necessary cleanup routines. This results in allocated memory blocks remaining resident in the system heap without being returned to the operating system for reuse.
From an operational perspective, this flaw enables a denial of service attack vector that relies on resource exhaustion rather than direct code execution. An attacker who has access to ImageMagick's processing capabilities can craft malicious PNG files or input streams designed specifically to trigger libpng initialization failures repeatedly. By submitting these malformed requests in rapid succession, the attacker forces the application to continuously allocate memory without releasing it. Over time, this unbounded memory consumption depletes the available system resources, leading to severe performance degradation for legitimate users and eventually causing the ImageMagick process or the entire host system to crash due to out-of-memory conditions. This type of attack is particularly dangerous in server-side environments where ImageMagick is used as a backend service for image processing tasks such as thumbnail generation, format conversion, or web application uploads, as it can effectively take down critical infrastructure without requiring authentication or elevated privileges if the input source is untrusted.
The technical implications extend beyond simple availability loss, as memory leaks in long-running services often lead to increased latency and instability even before a complete crash occurs. System administrators monitoring server metrics may observe steadily increasing RSS (Resident Set Size) values for ImageMagick processes correlated with high volumes of image processing requests. This behavior aligns with the MITRE ATT&CK technique T1496, Resource Hijacking, where an adversary consumes resources to disrupt service availability or potentially create conditions favorable for other attacks such as heap spraying if combined with additional vulnerabilities. The lack of proper error handling in this specific initialization path highlights a gap in defensive programming practices within the affected versions, emphasizing the importance of robust cleanup procedures even when primary operations fail early in their lifecycle.
Mitigation strategies primarily involve upgrading to patched versions of ImageMagick where this memory leak has been addressed by developers who implemented correct resource deallocation logic upon libpng initialization failure. Organizations relying on these older versions should implement strict input validation and rate limiting at the network or application layer to prevent rapid-fire requests that could trigger the vulnerability. Additionally, deploying system-level controls such as cgroups in Linux environments can help limit the maximum memory usage of ImageMagick processes, thereby containing the impact of a potential denial-of-service attempt until patches can be applied. Regular auditing of image processing workflows and ensuring that only trusted sources initiate encoding operations further reduces the attack surface associated with this flaw.