CVE-2026-25798 in ImageMagick
Summary
by MITRE • 02/24/2026
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, a NULL pointer dereference in ClonePixelCacheRepository allows a remote attacker to crash any application linked against ImageMagick by supplying a crafted image file, resulting in denial of service. Versions 7.1.2-15 and 6.9.13-40 contain a patch.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability CVE-2026-25798 represents a critical null pointer dereference flaw within ImageMagick's pixel cache repository cloning functionality. This issue affects the widely used open-source image processing library that serves as a foundation for numerous applications across various platforms and operating systems. The vulnerability specifically resides in the ClonePixelCacheRepository function which fails to properly validate input parameters during image file processing. Attackers can exploit this weakness by crafting malicious image files that trigger the null pointer dereference when applications attempt to process these specially formatted inputs. The flaw demonstrates a classic memory safety issue that has been categorized under CWE-476 which specifically addresses null pointer dereference conditions in software implementations. This type of vulnerability falls within the broader category of denial of service attacks as defined by the ATT&CK framework under the technique T1499 which encompasses various methods of disrupting system availability.
The technical exploitation of this vulnerability occurs when applications utilizing ImageMagick link against the affected library and process user-supplied image files without proper input validation. During the image parsing process, the ClonePixelCacheRepository function attempts to dereference a pointer that remains uninitialized or set to NULL, causing an immediate application crash. This behavior manifests across all versions prior to the security patches released in ImageMagick versions 7.1.2-15 and 6.9.13-40. The crash occurs because the function does not properly handle edge cases where pixel cache repository structures are not adequately initialized before cloning operations. The impact extends beyond simple application termination as it affects any software ecosystem that relies on ImageMagick for image processing capabilities, including web applications, content management systems, and digital asset management platforms. This vulnerability particularly affects server-side applications that accept file uploads from untrusted sources, creating a potential vector for automated denial of service attacks.
The operational impact of CVE-2026-25798 extends significantly beyond immediate service disruption to encompass broader security implications within software supply chains. Organizations utilizing vulnerable versions of ImageMagick face potential service degradation across multiple applications that depend on this library for image processing functionality. The vulnerability's remote exploitation capability means attackers can trigger crashes without requiring local system access, making it particularly dangerous in web-facing applications. System administrators must consider the cascading effects of such vulnerabilities, as a single compromised image file can potentially bring down entire web applications or backend services that rely on ImageMagick for processing user-generated content. The vulnerability's presence in widely distributed software components creates a substantial risk for organizations that may not immediately detect the exploitation attempts, as the denial of service can occur silently during normal application operation. This type of vulnerability demonstrates how seemingly minor memory management issues can create significant operational risks in enterprise environments where image processing capabilities are integral to business operations.
Mitigation strategies for CVE-2026-25798 require immediate patching of affected ImageMagick installations to versions 7.1.2-15 or 6.9.13-40 where the null pointer dereference has been addressed. Organizations should conduct comprehensive inventory assessments to identify all systems utilizing vulnerable ImageMagick versions and prioritize patch deployment across their infrastructure. Additional defensive measures include implementing robust input validation mechanisms at application layers that process user-supplied images, employing sandboxed execution environments for image processing operations, and establishing network-level filters to detect and block suspicious image file patterns. The vulnerability's characteristics align with ATT&CK technique T1059 which covers command and control communications, as organizations should monitor for abnormal processing patterns that might indicate exploitation attempts. Security teams should also consider implementing automated scanning solutions that can detect and quarantine potentially malicious image files before they can trigger the vulnerable code paths. Organizations utilizing custom applications that directly interface with ImageMagick should also review their error handling mechanisms to ensure graceful degradation rather than complete application crashes when processing malformed input files.