CVE-2026-109269 in ImageMagick
Summary
by MITRE • 10/12/2026
ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 contains an information disclosure vulnerability in the JPEG decoder, which performs a read that exposes uninitialized memory when handling crafted input. Attackers can supply a crafted JPEG file for processing to disclose uninitialized memory contents.
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Analysis
by VulDB Data Team • 10/12/2026
The identified vulnerability resides within the image processing library ImageMagick, specifically affecting versions prior to 6.9.13-57 and version 7.x prior to 7.1.2-32. This flaw is located in the JPEG decoder module, which is responsible for parsing and interpreting Joint Photographic Experts Group format files. The core technical issue stems from improper memory management during the decoding process. When ImageMagick processes a specifically crafted JPEG file, it fails to properly initialize certain buffers or variables before reading data into them. This oversight results in an out-of-bounds read operation where the application accesses portions of system memory that have not been allocated for this specific purpose or cleared of previous contents. Consequently, instead of returning null values or handling the error gracefully, the decoder exposes raw bytes from uninitialized memory regions back to the user or subsequent processing stages.
This type of flaw is classified under Common Weakness Enumeration as CWE-200: Exposure of Sensitive Information to an Unauthorized Actor and more specifically aligns with CWE-457: Use of Uninitialized Variable. The attack vector requires the victim system to process a maliciously constructed JPEG image, which can be achieved through various means such as uploading the file via a web application interface, viewing it in a document viewer that utilizes ImageMagick for thumbnail generation, or processing images within an automated pipeline. Because the vulnerability relies on reading uninitialized memory rather than executing arbitrary code directly, it does not inherently allow for remote code execution but serves as a powerful information disclosure mechanism. The attacker can leverage this to extract sensitive data residing in the process's memory space at the time of decoding.
The operational impact of this vulnerability is significant due to the potential exposure of cryptographic keys, session tokens, passwords, or other confidential data that may reside in adjacent memory blocks. In web server environments where ImageMagick is commonly used for image manipulation services like resizing or format conversion, an attacker could send a crafted request containing the malicious JPEG payload. If successful, the response might include fragments of previous requests' data, leading to session hijacking or credential theft. This aligns with MITRE ATT&CK technique T1083: File and Directory Discovery if used in conjunction with other tools, but primarily falls under T1567: Exfiltration Over Web Service when the disclosed memory contents are transmitted back to an external server controlled by the attacker. The severity is heightened because JPEG files are ubiquitous on the internet, making this a high-probability target for automated scanning and exploitation campaigns.
Mitigation strategies must prioritize immediate patching of the ImageMagick installation to version 6.9.13-57 or later, or version 7.1.2-32 and above, where these memory initialization checks have been corrected by the development team. In environments where upgrading is not immediately feasible, administrators should implement strict input validation policies that reject JPEG files with anomalous headers or sizes indicative of crafted payloads. Additionally, deploying Web Application Firewalls to detect unusual patterns in image processing requests can provide a layer of defense against exploitation attempts. It is also recommended to run ImageMagick processes within restricted containers or sandboxed environments with limited memory access privileges to minimize the blast radius should an information disclosure occur. Regular security audits and dependency updates are essential to maintain resilience against such low-level memory management flaws in widely used open-source libraries.