CVE-2026-27596 in exiv2
Summary
by MITRE • 03/02/2026
Exiv2 is a C++ library and a command-line utility to read, write, delete and modify Exif, IPTC, XMP and ICC image metadata. Prior to version 0.28.8, an out-of-bounds read was found in Exiv2. The vulnerability is in the preview component, which is only triggered when running Exiv2 with an extra command line argument, like -pp. The out-of-bounds read is at a 4GB offset, which usually causes Exiv2 to crash. This issue has been patched in version 0.28.8.
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Analysis
by VulDB Data Team • 03/06/2026
The vulnerability identified as CVE-2026-27596 represents a critical out-of-bounds read flaw within the Exiv2 library, a widely used C++ library for managing image metadata. This security issue affects versions prior to 0.28.8 and demonstrates the inherent risks associated with metadata processing in image manipulation software. The flaw resides specifically within the preview component of Exiv2, which is activated through a particular command-line argument -pp that enables preview functionality. This targeted trigger mechanism suggests that the vulnerability is not automatically exploited during normal operation but requires specific user interaction or command execution to manifest.
The technical nature of this vulnerability places it firmly within CWE-125, which describes out-of-bounds read conditions that can lead to unpredictable behavior, crashes, or potential information disclosure. The out-of-bounds read occurs at a precise 4GB offset, indicating a sophisticated memory access error that likely stems from improper bounds checking in the preview handling code. This specific offset suggests that the library attempts to access memory locations far beyond the allocated buffer boundaries, creating a scenario where the program's memory management fails to properly validate input data. The predictable nature of this offset also indicates that an attacker could potentially craft malicious metadata to trigger this condition systematically, making it a viable target for exploitation.
The operational impact of this vulnerability extends beyond simple program crashes, as it represents a potential denial-of-service vector that could affect any system relying on Exiv2 for image metadata processing. When triggered, the out-of-bounds read typically results in application crashes, which could be particularly problematic in automated environments or services that process large volumes of image files. The preview functionality, while useful for users, becomes a dangerous attack surface when it fails to properly validate input data, potentially allowing attackers to disrupt services or create instability in applications that depend on Exiv2. This vulnerability could be particularly concerning for web applications, content management systems, or any platform that accepts user-uploaded images and processes their metadata.
Security practitioners should prioritize updating to Exiv2 version 0.28.8 or later, which contains the necessary patches to address this out-of-bounds read condition. The fix likely involves implementing proper bounds checking mechanisms within the preview component to prevent memory access violations at the 4GB offset. Organizations using Exiv2 in production environments should conduct thorough testing to ensure that the update does not introduce compatibility issues with existing workflows. Additionally, the vulnerability highlights the importance of input validation and memory safety practices in metadata processing libraries, as these components often handle untrusted data from various sources. The ATT&CK framework would classify this vulnerability under T1203, which involves exploitation of memory corruption vulnerabilities, emphasizing the need for robust memory management practices in software development. Given the nature of the flaw, organizations should also consider implementing additional input validation layers and monitoring for unusual memory access patterns when processing image metadata to detect potential exploitation attempts.