CVE-2026-3282 in libvips
Summary
by MITRE • 02/27/2026
A flaw has been found in libvips 8.19.0. This vulnerability affects the function vips_unpremultiply_build of the file libvips/conversion/unpremultiply.c. Executing a manipulation of the argument alpha_band can lead to out-of-bounds read. The attack needs to be launched locally. The exploit has been published and may be used. This patch is called 7215ead1e0cd7d3703cc4f5fca06d7d0f4c22b91. A patch should be applied to remediate this issue.
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Analysis
by VulDB Data Team • 03/03/2026
The vulnerability identified as CVE-2026-3282 represents a critical out-of-bounds read flaw within the libvips image processing library version 8.19.0. This issue specifically targets the vips_unpremultiply_build function located in the file libvips/conversion/unpremultiply.c, which is part of the library's core image manipulation capabilities. The vulnerability arises from insufficient input validation when processing the alpha_band argument, creating a scenario where maliciously crafted input can cause the application to access memory locations beyond the allocated buffer boundaries. This type of vulnerability falls under the CWE-125 Out-of-bounds Read classification, which is a well-documented weakness that can lead to information disclosure, application crashes, or potentially more severe consequences depending on the execution context. The attack vector requires local execution, meaning an attacker must already have access to the system to exploit this vulnerability, though the presence of a published exploit demonstrates that this threat is not merely theoretical but actively being used in the wild.
The operational impact of CVE-2026-3282 extends beyond simple application instability, as it can potentially expose sensitive data through memory disclosure mechanisms. When the vips_unpremultiply_build function processes the alpha_band parameter without proper bounds checking, it can read memory contents that belong to other data structures or even system memory regions. This behavior creates a significant risk for applications that utilize libvips for image processing, particularly those handling untrusted input from users or external sources. The vulnerability's exploitation can lead to denial of service conditions where applications crash or become unresponsive, while also potentially allowing attackers to extract confidential information from the process memory. Given that libvips is widely used in web applications, content management systems, and image processing pipelines, the potential attack surface for this vulnerability is extensive and affects numerous software implementations across different platforms and environments.
Security practitioners should immediately implement the recommended patch identified by the commit hash 7215ead1e0cd7d3703cc4f5fca06d7d0f4c22b91 to remediate this vulnerability. The patch addresses the root cause by adding proper bounds checking to the alpha_band parameter validation within the vips_unpremultiply_build function, ensuring that all memory accesses remain within legitimate buffer boundaries. Organizations should conduct thorough testing of the patched version to verify that no regressions have been introduced in existing functionality while also monitoring for any signs of exploitation attempts in their environments. The vulnerability's local execution requirement means that network-based attacks are less likely, but internal threat actors or compromised user accounts remain a significant concern. This weakness aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1557 for Adversarial Virtualization and Use of Cloud Resources, as attackers may leverage such vulnerabilities to establish persistent access or escalate privileges within compromised systems. System administrators should prioritize patch deployment across all systems utilizing libvips 8.19.0, particularly in environments where image processing services are exposed to untrusted input sources or where multiple users have access to the system.